A method for predicting the heterogeneity distribution of different types of adsorbed gas in shale
A heterogeneous and adsorbed gas technology, applied in the field of unconventional oil and gas exploration and development, can solve the problems of high cost, expensive measurement methods, unrealistic large-scale sampling, etc., and achieve the effect of simple technology, low cost and feasible operation
Inactive Publication Date: 2017-11-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
The existing resource evaluation of shale gas adsorbed gas basically uses the method of averaging the volume of source rocks for resource estimation, or performs observation and calculation for a single or limited sample. Limited samples cannot reflect the real complex with strong heterogeneity. Due to the actual situation of shale, the current technical methods cannot effectively predict the distribution of shale adsorbed gas with high precision.
And for actual samples, the measurement method is expensive and costly, and it is not realistic to take a large number of samples
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[0098] Taking the N-38 well area in Dongying Sag, Shandong Province as an example, the shale in this well is widely distributed, and the degree of exploration and geological understanding is relatively high; six typical shale blocks at different depths of the third member of Shahejie Formation in Well N-38 were selected as test samples , these 6 samples are all large mudstone samples with stable deposition, reflecting a certain representativeness.
[0099] Step 1. Establish a comprehensive prediction model for shale gas adsorbed gas content
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The invention belongs to the field of exploration and development of unconventional oil and gas, specifically, a method for predicting the heterogeneity distribution of different types of adsorbed gas in shale. The method includes the following steps: Step 1, establishing a conceptual model and a comprehensive prediction mathematical model of shale gas adsorbed gas content; Step 2, establishing a high-precision mathematical model for predicting organic matter content based on well logging information; Step 3, establishing a A high-precision mathematical model for predicting different mineral contents; step 4, calculating the amount of shale adsorbed gas, and evaluating the heterogeneity of shale adsorbed gas distribution. The present invention establishes conceptual models of different forms, and divides shale adsorption gas into organic matter adsorption gas, clay mineral adsorption gas, quartz adsorption gas, other clastic rock mineral adsorption gas, carbonate mineral adsorption gas and other salt mineral adsorption gas, and established a method model, which can calculate the content of these various forms of adsorbed gas.
Description
technical field [0001] The invention belongs to the field of unconventional oil and gas exploration and development, and in particular relates to a shale gas prediction model and method, which are used to predict the heterogeneity distribution of different types of adsorbed gas in shale. Background technique [0002] Shale gas refers to natural gas stored in fine-grained clastic rocks rich in organic matter, part of which exists in pores and fractures in a free state, and part of which is adsorbed on the surface of organic matter and minerals, which can be of biogenesis, pyrolysis or mixed origin , accumulate and form reservoirs under certain geological conditions and reach the value of economic exploitation. Shale adsorbed gas is an important form and component of shale gas, which is caused by the surface adsorption of organic and inorganic minerals in shale. It is first divided into organic matter adsorbed gas, clay mineral adsorbed gas, quartz adsorbed gas, Other clastic...
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IPC IPC(8): G01V11/00
Inventor 陈中红
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)