Inversion method of shale oil reservoir mineral component content and its application in the Fourth Member of the Shahejie Formation in the Damintun Sag, Liaohe Depression

Xiao Dianshi; Lu Shuangfang; Lu Zhengyuan; Zhang Luchuan; Guo Siqi; Gu Meiwei

doi:10.11743/ogg20160106

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Inversion method of shale oil reservoir mineral component content and its application in the Fourth Member of the Shahejie Formation in the Damintun Sag, Liaohe Depression
Vol. 37, Issue 1, Pages: 37-44(2016)
Online First：08 February 2016，

Published：2016
DOI： 10.11743/ogg20160106
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DOI：

Xiao Dianshi, Lu Shuangfang, Lu Zhengyuan, et al. Inversion method of shale oil reservoir mineral component content and its application in the Fourth Member of the Shahejie Formation in the Damintun Sag, Liaohe Depression[J]. 2016, 37(1): 37-44. DOI： 10.11743/ogg20160106.

摘要

准确刻画泥页岩中矿物含量是页岩油层脆性评价的关键。泥页岩富含有机质、矿物组分复杂，传统全体积模型解释方法的精度较低。以渤海湾盆地辽河坳陷大民屯凹陷沙四段页岩油为例，根据全岩及地化测试资料，剖析该区泥页岩的岩性、矿物组成及曲线响应特征，构建适用于泥页岩的体积模型及曲线响应方程；采用基于遗传算法的最优化方法对页岩油层进行处理，得到地层的矿物组分含量、孔隙度及干酪根含量等参数。实际处理结果表明，多矿物反演预测的矿物变化趋势与ECS（元素俘获测井）结果一致，其精度明显高于线性拟合。从含油性及可压裂性的角度建立页岩油甜点标准，利用多矿物解释成果有效指导了页岩油甜点层位的优选。

Abstract

Accurate characterization of mineral content is the key to evaluate its fractability for shale oil reservoir.Because of being rich in organic matter and with complex mineral composition

mineral evaluation with traditional volume model method is of low accuracy.This paper took the fourth member of the Shahejie Formation shale-oil reservoir in the Damintun Sag of Liaohe Depression

Bohai Bay Basin as an example.Bulk rock analysis and geochemistry test data were used to analyze lithology

mineral composition and curve response characteristics of the shale-oil reservoir

and then constructed the volume model and logging response equation suitable for the shale-oil reservoir.Genetic algorithm-based optimization method was utilized to calculate mineral composition

porosity and kerogen content.The calculation results showed that the mineral distribution predicted by multi-mineral inversion method was consistent with that of ECS

and its precision was obviously higher than that of linear fitting.The standards of shale-oil sweet spot were built in terms of oil-bearing property and fracability.The multi-mineral interpretation results can effectively guide sweet spot identification of shale oil.