A method for evaluating the potential of shale oil resources in shale formations

Abstract

The invention relates to an evaluation method of a shale oil resource potential in shale strata series. The evaluation method comprises the steps that essential data are sorted, wells are selected evenly in work areas, models are built, organic geochemistry well logging is verified, shale oil grading evaluation standard is built, a classification standard of the shale strata series is put forward, light dydrocarbon and heavy hydrocarbon in the shale oil in the shale strata series are revised, saturation adsorption oil mass of shale is calculated, shale oil resource potential is evaluated in a grading mode according to the grading standard, shale saturation adsorption oil mass is determined with application of a geochemical data statistic analysis graphic method, then movable quantity of shale oil is calculated, and shale oil resource quantity of a sandstone thin interlayer of the shale strata series is calculated with utilization of the 'hole-oil saturation' method. According to the evaluation method of the shale oil resource potential in the shale strata series, due to the fact that the concept of the shale strata series is put forward and built, the scientific space position of the shale oil is clearly determined. The evaluation method further puts forwards a calculation method of the shale saturation adsorption oil quantity and the shale oil movable quantity, and significance is provided for judging whether a work area has a shale oil development value.

Description

technical field [0001] The invention relates to an evaluation method for unconventional oil and gas exploration, in particular to an evaluation method for shale oil resource potential in mud shale formations. Background technique [0002] The basic standards for enrichment and recoverability of shale oil and gas in North America, where shale oil and gas have been successfully explored and developed in the world, are: higher abundance of organic matter, higher maturity, better type of organic matter, and higher content of brittle minerals ( low content of clay minerals). However, the relevant concepts and algorithms of shale formations and saturated adsorbed oil have not been proposed and established. The important reason is that the successful exploration and development of shale oil and gas in North America is basically in relatively uniform marine strata, with small facies change and strong homogeneity, and it can basically be determined by using limited drilling and labo...

AI Technical Summary

Problems solved by technology

Determine the amount of saturated oil absorbed by shale and calculate the movable amount of shale oil, which solves the problem that people cannot evaluate the movable amount of shale oil in the past, and provides technical support for the actual exploration of shale oil in oilfields

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