CN106408456B

CN106408456B - Evaluation method of encirclement resource quantity

Info

Publication number: CN106408456B
Application number: CN201610973699.9A
Authority: CN
Inventors: 齐仁理; 任萍; 徐田武; 高秋灵; 徐深谋; 赵余乐; 万龙
Original assignee: China Petroleum and Chemical Corp; Exploration and Development Research Institute of Sinopec Zhongyuan Oilfield Co
Current assignee: China Petroleum and Chemical Corp; Exploration and Development Research Institute of Sinopec Zhongyuan Oilfield Co
Priority date: 2016-11-03
Filing date: 2016-11-03
Publication date: 2022-02-18
Anticipated expiration: 2036-11-03
Also published as: CN106408456A

Abstract

The invention relates to an evaluation method of a closure resource amount, and belongs to the field of oil-gas exploration. And acquiring the effective volume and the crude oil density of the trap in the area to be evaluated by using the geological data of the area to be evaluated. And establishing a mathematical model for representing the oil content weight of the trap in the area to be evaluated according to the corresponding relation between the surface adsorption hydrocarbon value and the microorganism abnormal value of the oil-gas trap, the non-oil-gas trap and the trap in the area to be evaluated, and determining the resource content of the trap in the area to be evaluated. The method weakens the influence of subjective human factors to the maximum extent, and can determine that the area is less than 0.5km²And the resource scale of the trap of the well drilling does not exist, so that a reliable basis is provided for the drilling of an oil company in the trap of the area to be evaluated.

Description

Evaluation method of encirclement resource quantity

Technical Field

The invention relates to the field of oil and gas exploration, in particular to an evaluation method of a closure resource amount.

Background

Oil and gas are all in underground traps, and the traps with large sizes and small sizes are identified by means of drilling, earthquake and the like after years of oil exploration. In which theWhen large traps have been drilled, considerable residual resources remain to be present in areas less than 0.5km²Among the small traps, whether the resource scale of the small traps is worth drilling or not becomes a practical problem to be solved urgently by oil companies. Chinese patent No. 201410410322.3 discloses a method for screening traps, which analyzes from the trapped elements, and utilizes the geological risk threshold to collect the probabilities of trapping, filling, storing and storing four main factors, so as to realize a uniform trap screening method, which is more suitable for traps with large trap area and relatively perfect geological data, but less than 0.5km for the area²And as far as no trap of a well is available, probability collection of four main factors of the patent is difficult and unsuitable for operation. Before drilling, oil companies focused on the oil-bearing nature of the traps, which, if oil-bearing, increased the free hydrocarbon content between surface soil particles and adsorbed hydrocarbon content between soil mineral lattices, and abnormal microbial development in the surface soil directly above the traps, based on hydrocarbon microleakage theory and vertical migration theory. The trapped oil-bearing capacity can therefore be judged by measuring surface adsorbed hydrocarbons and microbial anomalies. Chinese patent No. 201510288035.4 discloses a method and apparatus for predicting soil light hydrocarbon index, which provides a method for measuring the content of hydrocarbons adsorbed on the earth's surface. Further, the probability of the factor of the hydrocarbons adsorbed on the surface may be influenced by human activities and environmental pollution, which may cause an abnormality, and if the size of the trap resource is estimated by using the hydrocarbons adsorbed on the surface alone, the evaluation accuracy of the trap resource amount is low.

Disclosure of Invention

The invention aims to provide an evaluation method of the trap resource amount, and overcomes the defects that in the prior art, the trap resource amount evaluation has more selection factors and is difficult to obtain, and the factors of surface adsorption of hydrocarbon are independently adopted for calculation, so that the risk is higher, the parameters are inaccurate, the uncertainty is higher, and the precision of the trap resource amount evaluation is low.

In order to achieve the purpose, the technical scheme adopted by the evaluation method of the entrapment resource content is that geological data of a to-be-evaluated area is utilized to obtain the effective volume and the crude oil density of the entrapment in the to-be-evaluated area, a mathematical model for representing the oil content weight of the entrapment in the to-be-evaluated area is established according to the corresponding relation between the surface adsorption hydrocarbon value and the microorganism abnormal value of the oil-gas entrapment, the non-oil-gas entrapment and the entrapment in the to-be-evaluated area in the area where the entrapment in the to-be-evaluated area is located, and the entrapment resource content in the to-be-evaluated area is determined.

The invention comprises the following steps:

1. determining the effective volume of the trap in the area to be evaluated according to the geological data of the area to be evaluated:

collecting geological data of an area where a trap in an area to be evaluated is located, which specifically comprises the following steps: the top surface structure diagram of the region where the trap in the region to be evaluated is located, the effective thickness and the effective porosity of the reservoir of the trap in the region to be evaluated, and the effective volume V of the trap in the region to be evaluated are determined_e。

2. The method for establishing the mathematical model for representing the oil content weight of the trap in the area to be evaluated according to the corresponding relation between the surface adsorption hydrocarbon value and the microorganism abnormal value of the oil-gas trap, the non-oil-gas trap and the trap in the area to be evaluated, wherein the trap is located in the area to be evaluated, and the mathematical model comprises the following steps:

(1) screening drilled oil-gas-containing traps and non-oil-gas-containing traps in the region where the traps in the region to be evaluated are located, sampling at the high points of the respective traps, and measuring the surface adsorption hydrocarbon value K of the drilled oil-gas-containing traps₁And microbial anomaly value M₁(ii) a Hydrocarbon value K of non-oil-gas-containing trap surface adsorption₂And microbial anomaly value M₂；

(2) Setting a surface adsorption hydrocarbon value K and a microorganism abnormal value M which are sampled and measured at a trap high point in an area to be evaluated;

(3) establishing a mathematical model of the oil-containing weight P of the trap in the area to be evaluated according to the corresponding relation between the earth surface adsorption hydrocarbon value K and the microorganism abnormal value M measured by the trap in the area to be evaluated, wherein P ═ P (P ═ P)₁+P₂)/2；

Wherein: p₁＝(K-K₂)/(K₁-K₂)*100％；

P₂＝(M-M₂)/(M₁-M₂)*100％；

P₁The weight of the oil content is measured by the hydrocarbon adsorption value on the earth surface;

P₂the weight of the oiliness is measured by the abnormal value of the microorganism.

3. Sampling at a trap high point in a region to be evaluated, measuring a surface adsorption hydrocarbon value K and a microorganism abnormal value M of the sample, and determining an oil content weight P representing the trap resource content in the region to be evaluated; if K₂<K<K₁The K value is calculated by using the measured value; if K>K₁If K is equal to K₁(ii) a If K<K₂If K is equal to K₂(ii) a If M is₂<M<M₁The M value is calculated by using the measured value; if M is>M₁If M is equal to M₁(ii) a If M is<M₂If M is equal to M₂。

4. Utilizing the density rho of the trapped crude oil in the area to be evaluated and utilizing the effective volume V of the trap in the area to be evaluated determined in the step 1_eAnd 3, determining an oil content weight P representing the trap resource content in the to-be-evaluated area, and determining a trap resource content Z in the to-be-evaluated area;

as shown in formula 1:

trap resource quantity Z ═ P × V_eρ. (formula 1)

The method utilizes the earth surface adsorption hydrocarbon content value and the microorganism abnormal value of the area to be evaluated to establish a mathematical model of the oil content weight P of the enclosed area to be evaluated, the obtained oil content weight has high precision, and the area less than 0.5km can be determined by combining with the known geological data²And the resource scale of the trap of the well drilling does not exist, so that the influence of subjective human factors is weakened to the maximum extent, and a reliable basis is provided for the drilling of an oil company in the trap of the area to be evaluated.

Drawings

FIG. 1 is a flow chart of the technical solution of the present invention.

Detailed Description

By enclosure A in the Y basin₁Trap A₂Trap A₃The present invention will be described in detail with reference to resource amount evaluation as an example.

As can be seen from FIG. 1, the specific steps of the present invention are as follows:

1. collecting the trap A to be evaluated in the Y basin (trap A)₁Trap A₂Trap A₃) The geological data of the area specifically includes: trap A₁Trap A₂Trap A₃The top surface structure diagram, the effective thickness and the effective porosity of the reservoir in the area are respectively enclosed in a₁Trap A₂Trap A₃The area of the trap is measured on the top surface structure diagram of (1), and the trap A is calculated₁Effective volume V of_A1eTrap A₂Effective volume V of_A2eTrap A₃Effective volume V of_A3e；

Effective thickness of reservoir N_A1＝13m；N_A2＝13m；N_A3＝13m；

Effective porosity parameter Q_A1＝12％；Q_A2＝12％；Q_A3＝12％；

Are respectively at the trap A₁Trap A₂Trap A₃On the top surface structure diagram, the trap overflow point and the closing height are measured and obtained, and the trap area is calculated as S_A1＝0.45km²，S_A2＝0.40km²，S_A3＝0.37km²；

Calculating the effective volume V of trap_A1e＝13*12％*0.45*10⁶＝0.702*10⁶m³；

Calculating the effective volume V of trap_A2e＝13*12％*0.40*10⁶＝0.624*10⁶m³；

Calculating the effective volume V of trap_A2e＝13*12％*0.37*10⁶＝0.577*10⁶m³。

2. According to the corresponding relation among the surface hydrocarbon adsorption value and the microorganism abnormal value of the drilled hydrocarbon-containing trap B, the non-hydrocarbon-containing trap C and the trap A to be evaluated in the area where the trap A to be evaluated is located in the Y basin, a mathematical model of the oil-containing weight representing the resource content of the trap A in the Y basin is established:

2.1 oil-gas trap B and non-oil trap B drilled in the area of trap A in basin YDesigning 2 sampling points at the high point of the oil-gas trap C, and measuring the value K of the surface adsorbed hydrocarbon of the drilled oil-gas trap B₁And microbial anomaly value M₁Surface adsorption of hydrocarbon value K without hydrocarbon trap C₂And microbial anomaly value M₂；

The measured data were: k₁＝220；K₂＝35；M₁＝156；M₂＝28；

2.2 setting a surface adsorption hydrocarbon value K and a microorganism abnormal value M which are sampled and measured at a high point of a trap A to be evaluated in a basin Y;

2.3 according to the corresponding relation between the surface adsorption hydrocarbon value and the microorganism abnormal value of the drilled oil-gas-containing trap B, the non-oil-gas-containing trap C and the trap A to be evaluated, establishing a mathematical model of the oil-containing weight P of the trap A to be evaluated in the basin Y, wherein P is (P ═ P₁+P₂)/2；

Wherein: p₁＝(K-K₂)/(K₁-K₂)*100％＝(K-35)/(220-35)*100％；

P₂＝(M-M₂)/(M₁-M₂)*100％＝(M-28)/(156-28)*100％。

3. Traps A in the Y basin respectively₁Trap A₂Trap A₃Sampling at the high point, and determining the surface adsorption hydrocarbon value K and the microorganism abnormal value M of each trap;

the measured data were: k_A1＝180，M_A2＝97；K_A2＝90；M_A2＝57；K_A3＝210；M_A3＝140；

Substituting the measured K and M values into the mathematical model in the step 2.3 to obtain the trap A₁P of_A1Trap A₂P of_A2Trap A₃P of_A3；

P_1A1＝(K-35)/(220-35)*100％＝(180-35)/(220-35)*100％＝78.38％；

P_2A1＝(M-28)/(156-28)*100％＝(97-28)/(156-28)*100％＝53.91％；

P_A1＝(P_1A1+P_2A1)/2＝(78.38％+53.91％)/2＝66.15％；

P_1A2＝(K-35)/(220-35)*100％＝(90-35)/(220-35)*100％＝29.73％；

P_2A2＝(M-28)/(156-28)*100％＝(57-28)/(156-28)*100％＝22.66％；

P_A2＝(P_1A2+P_2A2)/2＝(29.73％+22.66％)/2＝26.20％；

P_1A3＝(K-35)/(220-35)*100％＝(210-35)/(220-35)*100％＝94.59％；

P_2A3＝(M-28)/(156-28)*100％＝(140-28)/(156-28)*100％＝87.50％；

P_A3＝(P_1A3+P_2A3)/2＝(94.59％+87.50％)/2＝91.05％。

4. Separately obtain traps A in the Y basin₁Trap A₂Trap A₃Using the effective volume V of the trap A determined in step 1_AeAnd 3, determining the oil content weight P of the trap A, and determining the resource quantity Z of the trap A_A；

Trap A₁Crude oil density of [ rho ]_A1＝0.85g/cm³＝0.85*10³kg/m³；

Trap A₂Crude oil density of [ rho ]_A2＝0.85g/cm³＝0.85*10³kg/m³；

Trap A₃Crude oil density of [ rho ]_A3＝0.85g/cm³＝0.85*10³kg/m³；

Trapped resource amount Z_A＝P*V_Ae*ρ；

Z_A1＝66.15％*0.702*10⁶*0.85*10³＝0.395*10⁹kg＝0.395*10⁶T；

Z_A2＝26.20％*0.624*10⁶*0.85*10³＝0.139*10⁹kg＝0.139*10⁶T；

Z_A3＝91.05％*0.577*10⁶*0.85*10³＝0.447*10⁹kg＝0.447*10⁶T；

Trap A₁The trap resource amount of (2) is 0.395 x 10⁶Ton, trap A₂The trap resource amount of (2) is 0.139 × 10⁶Ton, trap A₃The trap resource amount of (2) is 0.447 x 10⁶Ton, thus giving the trap A₃The resource amount of (2) is the largest, and the resource size is the largest among 3 traps to be evaluated.

Claims

1. A method for evaluating the amount of enclosed resources is characterized by comprising the following steps: acquiring the effective volume and the crude oil density of the trap in the area to be evaluated by using geological data of the area to be evaluated, establishing a mathematical model representing the oiliness weight of the trap in the area to be evaluated according to the corresponding relation between the surface adsorption hydrocarbon value and the microorganism abnormal value of the oil-gas trap, the non-oil-gas trap and the trap in the area to be evaluated, and determining the resource content of the trap in the area to be evaluated;

the method for establishing the mathematical model for representing the oil content weight of the trap in the to-be-evaluated area comprises the following steps of:

(3) establishing a mathematical model of the oil-containing weight P of the trap in the area to be evaluated according to the corresponding relation between the earth surface adsorption hydrocarbon value K and the microorganism abnormal value M measured by the trap in the area to be evaluated, wherein P = (P)₁+P₂)/2；

Wherein: p₁=（K-K₂）/（K₁-K₂）*100%；

P₂=（M-M₂）/（M₁-M₂）*100%；

P₁For oil-containing properties measured by surface adsorption of hydrocarbonsA weight value;

2. The method for evaluating the amount of circled resources according to claim 1, wherein: sampling at a trap high point in a region to be evaluated, measuring a surface adsorption hydrocarbon value K and a microorganism abnormal value M of the sample, and determining an oil content weight P representing the trap resource content in the region to be evaluated; if K₂<K<K₁The K value is calculated by using the measured value; if K>K₁Let K = K₁(ii) a If K<K₂Let K = K₂(ii) a If M is₂<M<M₁The M value is calculated by using the measured value; if M is>M₁If M = M, then let M = M₁(ii) a If M is<M₂If M = M, then let M = M₂。

3. The method according to claim 1 or 2, wherein: using the density rho, effective volume V of trapped crude oil in the area to be evaluated_eAnd an oil-containing weight P representing the trap resource amount in the to-be-evaluated area, and determining the trap resource amount Z in the to-be-evaluated area: trap resource amount Z = P × V_e*ρ。