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Method of quantitative evaluation on oil and gas accumulation conditions based on seismic data

A technology for oil and gas accumulation and quantitative evaluation, which is applied in the field of seismic exploration and development, and can solve problems such as the inability to quantitatively evaluate oil and gas accumulation conditions

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] The present invention aims at the defect that the existing technology cannot quantitatively evaluate the oil and gas accumulation conditions under the condition of lack of drilling and logging data, and provides a quantitative evaluation method for oil and gas accumulation conditions based on seismic data

Method used

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  • Method of quantitative evaluation on oil and gas accumulation conditions based on seismic data
  • Method of quantitative evaluation on oil and gas accumulation conditions based on seismic data
  • Method of quantitative evaluation on oil and gas accumulation conditions based on seismic data

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Embodiment Construction

[0054] like figure 1 As shown, the quantitative evaluation method of hydrocarbon accumulation conditions based on seismic data includes the following steps;

[0055] The residual pressure P of the source rock on the sandstone lens s Quantitative evaluation is carried out, and the evaluation steps are as follows:

[0056] Step 1-1, correcting the seismic velocity spectrum to obtain the stacking velocity V s ;

[0057] When the formation is a horizontal layered medium, the stacking velocity V s is the root mean square velocity V r ; When there is an inclination angle at the stratum interface, the stacking velocity V s is the equivalent velocity, the inclination correction is performed on the equivalent velocity to obtain the root mean square velocity V r ;

[0058] V r =V s cosα(3);

[0059] Among them, α is the inclination angle of the reflective interface, V s is the stacking speed m / s;

[0060] Step 1-2, by superimposing the velocity V s Get RMS Velocity V r , ...

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Abstract

The invention is a method of quantitative evaluation on oil and gas accumulation conditions based on seismic data. According to the evaluation method, a mathematical model between seismic parameters such as seismic interval velocity and sandstone lens body reflection amplitude and hydrocarbon source rock residual pressure and equivalent hydrocarbon expulsion pressure is determined, the seismic interval velocity is acquired through seismic data correcting, and the hydrocarbon source rock residual pressure of a sandstone lens body is acquired according to the seismic interval velocity. Further, the sand body porosity is acquired according to the true thickness of the sandstone lens body, the equivalent hydrocarbon expulsion pressure is acquired according to the sand body porosity, and the oil and gas accumulation index of the sandstone lens body is acquired according to the hydrocarbon source rock residual pressure and the equivalent hydrocarbon expulsion pressure, thus completing quantitative evaluation on oil and gas accumulation conditions of the sandstone lens body. Quantitative evaluation on accumulation conditions of the sandstone lens body is realized with the use of the seismic parameters under the condition of lack of drilling and logging data, and the efficiency of exploration is improved.

Description

technical field [0001] The invention belongs to the field of seismic exploration and development, in particular to a quantitative evaluation method for oil and gas accumulation conditions based on seismic data. Background technique [0002] Lithologic reservoirs have become an important exploration target in eastern my country. The practice of lithologic reservoir exploration shows that not all sandstone bodies wrapped in source rocks can form lithologic reservoirs. How to effectively predict and quantitatively calculate the accumulation quality of lithologic oil and gas reservoirs has always been a hot research topic in the field of petroleum exploration. [0003] In recent years, many scholars at home and abroad have carried out fruitful research on lithological accumulation conditions, pointing out that whether sandstone accumulation depends on the permeability of the sandstone itself and the residual pressure between the source rock and the sandstone, that is, the accumu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 张建宁吕公河李子锋黎娜
Owner CHINA PETROLEUM & CHEM CORP
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