Method for predicting oil content of shale oil reservoir

Abstract

The invention provides a method for predicting the oil content of a shale oil reservoir. The method comprises the following steps of 1) calculating the organic carbon content of the shale oil reservoir; 2) calculating the organic carbon content of a non-coring well or a layer section; 3) testing the oil content according to a core to obtain a relation between the oil content and the organic carbon content; 4) fitting out a relationship between the oil content and a logging sensitive parameter; 5) according to well area VSP data, acoustic logging data of well logging while drilling or production logging and transverse wave logging data, calculating a longitudinal and transverse wave speed ratio, and identifying the fluid properties of the reservoir; 6) identifying a low-resistivity oil layer; 7) performing interpolation calculation on the calculated single-well oil content and organic carbon; and 8) calculating and drawing a regional oil content distribution map according to the constraint and the false values of the removed oil content and organic carbon. According to the method, the oil content of the shale oil reservoir can be predicted, the oil content range and the oil content boundary of an oil-containing area can be described, drilling of infill wells or new wells in an old well area can be guided, and the drilling rate of the reservoir is improved.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, and relates to a method for predicting the oil content of shale oil reservoirs. Background technique [0002] At present, the evaluation of the oil content of shale oil reservoirs mainly includes the following two methods: one is to quantitatively test the oil content of the target layer by using the core while drilling. This method is relatively accurate and can directly reflect the oil content of the drilling section of the reservoir. The second is to use the empirical mathematical method to evaluate the entire interval using LWD and production logging data, but the empirical formula needs to obtain the organic matter maturity value. The maturity of organic matter should be calculated according to the vitrinite reflectance of shale, and the process of calculating the vitrinite reflectance is cumbersome and inconvenient to complete; the above two methods are to evaluate the oil c...

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Problems solved by technology

[0002] At present, the evaluation of the oil content of shale oil reservoirs mainly includes the following two methods: one is to quantitatively test the oil content of the target layer by using the core while drilling. This method is relatively accurate and can directly reflect the oil content of the drilling section of the reservoir. The second is to use the empirical mathematical method to evaluate the entire interval using LWD and production logging data, but the empirical formula needs to obtain the organic matter maturity value. The maturity of organic matter should be calculated according to the vitrinite reflectance of shale, and the process of calculating the vitrinite reflectance is cumbersome and inconvenient to complete; the above two methods are to evaluate the oil content of a single well, but they cannot to evaluate the oiliness of the reservoir

Scholars at home and abroad have established a quantitative linear relationship between organic carbon content and logging curves by means of the △LogR technique, namely the superposition method of acoustic transit time logging curves and resistivity curves and the superposition method of natural gamma ray logging curves and resistivity logging curves. , and then determine the quantitative relationship between oil content and logging sensitive parameters, but it is also for the quantitative evaluation of a single well

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