塔巴庙区块山西组高分辨率层序地层学研究

以高分辨率层序地层学理论为指导,以露头剖面、钻井岩心、测井资料的综合研究为基础,研究了塔巴庙区块下二叠统山西组的高分辨率层序地层学特征,识别和划分了一个超长期、两个长期、六个中期及若干个短期基准面旋回层序。详细分析了不同级次基准面旋回层序的叠加式样、沉积序列、岩性岩相组合等特征。在此基础上,讨论了基准面旋回层序与天然气富集的关系,认为主要气层段主要处于长期及中期旋回的底部,即基准面上升阶段的早期或湖平面下降的低水位时期及湖侵期的开始时期。

Study on high resolution sequence stratigraphy of Shanxi formation in Tabamiao block

Under the guidance of theory of the high-resolution sequence stratigraphy,and through the comprehensive analysis of outcrops profile,drilled cores and well logs, the high-resolution sequence stratigraphic characteris-tics of Shanxi formation,lower Permian in Tabamiao block were studied.Some short-term,6 middle-term,2 long-term,and 1 superlong-term base-level cyclical sequences were recognized and classified.The characteristics of stacking patterns,sedimentary se-quence,lithologic-facies association of different-or-der base-level cyclical sequences were analyzed in detail.Based on these studies,the relationship between the base-level cyclical sequence and natuial gas enrichment was discussed.It is considered that main gas intervals were at the bottom of long-and-middle-term cycles,that is,early stage of base-level raising or low-water level stage of lake plane decreasing and be-ginning of lake invasion stage.