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Method for evaluating effectiveness of overlying strata

An effective and caprock technology, applied in the field of oil and gas exploration, which can solve the problem of inability to achieve effective evaluation of caprocks

Active Publication Date: 2020-02-07
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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Problems solved by technology

[0006] To sum up, most of the existing cap rock evaluation methods are based on single-factor evaluation, that is, the effectiveness of cap rock is still evaluated based on the analysis of lithology, thickness and physical properties. For areas that have undergone multiple periods of transformation, it is impossible to achieve an effective evaluation of the caprock

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  • Method for evaluating effectiveness of overlying strata
  • Method for evaluating effectiveness of overlying strata
  • Method for evaluating effectiveness of overlying strata

Examples

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Effect test

Embodiment 1

[0048] Example 1: Taking the Shizhu syncline in Western Hubei-Eastern Chongqing as an example

[0049] (1) Determine the structural characteristics of the study area and the thickness distribution of the main cap rocks (see figure 1 ). According to the statistics of oil and gas wells and failed wells, the formation thickness in the effective caprock development area is at least 300m. In most areas of the Shizhu syncline in the Western Hubei-Eastern Yu region, the thickness of the shale formation is greater than 300m, and the macroscopic conditions of the caprock are good.

[0050] (2) According to the water chemical zoning, the minimum buried depth is determined to be 500m (see figure 2 ). Excluding the impact of structural surface water and groundwater in the fault zone, statistics show that the water chemical alternation block zone is below 500m, indicating that the preservation conditions are good.

[0051] (3) According to the breakthrough pressure and ultramicropore...

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Abstract

The invention relates to a method for evaluating the effectiveness of overlying strata. The method comprises the following steps: dynamically evaluating the effectiveness of the overlying strata by adopting macroscopic indexes; evaluating the effectiveness of the overlying strata by adopting microscopic indexes; and evaluating the effectiveness of the overlying strata by adopting stratum water chemistry and stratum water organic geochemical indexes. According to the method, the effectiveness of the overburden is qualitatively researched according to macroscopic factors such as rock stratum lithology, burial depth, thickness and distribution of different structural parts, and then the closure of the overlying strata is quantitatively evaluated by combining microscopic research according tobreakthrough pressure and the content of ultramicropores less than 2.5 nm, and finally, the separation effect of the overlying strata on the stratum water is analyzed by combining the stratum water chemical characteristics, thereby finally realizing macroscopic-microscopic-hydrochemical three-in-one comprehensive evaluation of the effectiveness of the overlying strata.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and in particular relates to a method for evaluating the effectiveness of cap rocks. Background technique [0002] Chen Jianliang (Chen Jianliang, Shi Hesheng, Shu Yu et al. Application of logging caprock evaluation method in Zhuyi sag[J]. China Offshore Oil and Gas. 2007,19(3):157-160) Calculation of porosity using logging data processing Breakthrough pressure, and core analysis data as a calibration, combined with other research results, the quality of the caprock and the distribution of oil and gas were studied. [0003] Amirsaman Rezaeyan et al. (Amirsaman Rezaeyan,Seyyed Alireza Tabatabaei-Nejad,Elnaz Khodapanah,et al.A laboratory study on capillary sealingefficiency of Iranian shale and anhydrate caprocks[J].Marine and Petroleum Geology,2015,66(4):817-828 ) under the confining pressure of 24.13-37.92 MPa, the sealing performance of the caprock was evaluated by using the dif...

Claims

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Application Information

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IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 杨俊胡烨潘文蕾罗开平赵国伟杨帆彭金宁
Owner CHINA PETROLEUM & CHEM CORP
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