Judgment method of carbonization of organic matter in shale
A technology of organic matter and organic carbon, which can be used in electric/magnetic exploration, re-radiation of sound waves, instruments, etc., and can solve problems such as carbonization or graphitization of organic matter
Inactive Publication Date: 2019-07-26
CHINA UNIV OF PETROLEUM (BEIJING)
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However, the southern part of my country has generally experienced complex tectonic movements in the later period, and in addition to the age of the strata, the degree of evolution of organic matter is generally high, reaching a high degree of maturity, and carbonization or graphitization of organic matter is prone to occur
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[0022] The invention provides a method for judging the carbonization or graphitization of shale organic matter. figure 1 It is a flow chart of the method for judging the carbonization of organic matter in shale according to the present invention. Such as figure 1 As shown, the method may include the following steps:
[0023] S101. Divide each of the plurality of shale samples whose logging resistivity value is less than or equal to the preset resistivity value into at least three equal parts; different shale samples correspond to different depths of wells.
[0024] Wherein, the logging resistivity value may be obtained according to logging data of each well. The plurality of shale samples may be at least 30 shale samples in each well, and the preset resistivity value may be, for example, 60Ω·m. The plurality of shale samples may be, for example, shale samples corresponding to preset depth sections in each well.
[0025] for example, figure 2 Corresponding graphs of depth...
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The invention provides a judgment method for judging the carbonization condition of organic matters in shale samples. The method comprises the steps of dividing each of a plurality of shale samples into at least three equal parts, wherein the logging resistivity values of the shale samples are smaller than or equal to a preset resistivity value; determining the organic carbon content TOC of a first sample in each sample; determining whether the logging resistivity values of the depths of wells corresponding to each of all samples are in the negative correlation or not; if yes, determining the dry sample resistivity value of a second sample in each sample and the content of conductive mineral components in a third sample of each sample; if the dry sample resistivity value of the second sample in each sample is not in the negative correlation with the content of conductive mineral components in the third sample of each sample, determining the carbonization condition of organic matters in the rock stratum at the depth of the well corresponding to each sample. Therefore, whether the carbonization condition of organic matters causes the reduced resistivity of the shale or not can be accurately determined. Furthermore, the gas resource of the shale can be accurately evaluated.
Description
technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and relates to a method for judging the carbonization of shale organic matter. Background technique [0002] At present, the exploration and development of shale gas has become the most important exploration target in unconventional oil and gas exploration. The organic shale in southern my country is widely distributed, with thick deposits and high abundance of organic matter, and has good oil and gas exploration potential. However, the southern part of my country has generally experienced complex tectonic movements in the later period, and the age of the strata is old, and the evolution degree of organic matter is generally high, reaching a high over-maturity, and carbonization or graphitization of organic matter is prone to occur. [0003] Since shale gas such as methane mainly exists in the pores of organic matter in shale, the carbonization or gra...
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IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 高凤琳宋岩姜振学张欣欣陈磊黄璞魏凯王幸蒙
Owner CHINA UNIV OF PETROLEUM (BEIJING)