中国陆相中高成熟度页岩油非均质地质条件与差异富集特征

基于页岩油基本地质条件和富集特征的对比研究,明确了中国陆相中高成熟度页岩油源储条件的非均质性与差异化富集特征.研究认为:①相比北美页岩油大面积分布的较为均质的源储等有利条件,中国陆相中高成熟度页岩油形成地质条件总体上差异明显,陆相多旋回构造演化形成了多期多类型湖盆,不仅为陆相页岩油规模发育提供场所,也形成了规模优质源岩...

Heterogeneous geological conditions and differential enrichment of medium and high maturity continental shale oil in China

Based on the comparison of basic geological conditions and enrichment characteristics of shale oil plays,the heterogeneity of source and reservoir conditions and differential enrichment of medium-high maturity continental shale oil plays in China have been confirmed.(1)Compared with the homogeneous geological settings and wide distribution of marine shale oil strata in North America,the continental medium and high maturity shale oil plays in China are significantly different in geological conditions generally;continental multi-cyclic tectonic evolution forms multiple types of lake basins in multi-stages,providing sites for large-scale development of continental shale oil,and giving rise to large scale high-quality source rocks,multiple types of reservoirs,and diverse source-reservoir combinations with significant heterogeneity.(2)The differences in sedimentary water environments lead to the heterogeneity in lithology,lithofacies,and organic material types of source rocks;the differences in material source supply and sedimentary facies belt result in reservoirs of different lithologies,including argillaceous and transition rocks,and tight siltstone,and complex source-reservoir combination types.(3)The heterogeneity of the source rock controls the differentiation of hydrocarbon generation and expulsion,the diverse reservoir types make reservoir performance different and the source-reservoir configurations complex,and these two factors ultimately make the shale oil enrichment patterns different.Among them,the hydrocarbon generation and expulsion capacity of high-quality source rocks affects the degree of shale oil enrichment.Freshwater hydrocarbon source rocks with TOC larger than 2.5%and saline hydrocarbon source rocks with TOC of 2%to 10%have high content of retained hydrocarbons and are favorable.(4)High-abundance organic shale is the basis for the enrichment of shale oil inside the source.In addition to being retained in shale,liquid hydrocarbons migrate along laminae,diagenetic fractures,and thin sandy layers,and then accumulate in laminae of muddy siltstone,siltstone,and argillaceous dolomite,and dolomitic siltstone suites etc.with low organic matter abundance in the shale strata,resulting in differences in enrichment pattern.