神木气田山西组和太原组天然气成藏特征及主控因素

Characteristics of natural gas SRCA-forming and their main controlling factors in Shanxi and Taiyuan Formations of Shenmu Gasfield

近年来大量的天然气勘探证实鄂尔多斯盆地东部神木气田具有良好的勘探开发潜力．为指导神木气田山西组和太原组的勘探和开发，利用大量地震、露头、钻井、测井、录井及分析化验等资料．研究了神木气田上古生界二叠系山西组、太原组气藏的天然气成藏特征，探讨了成藏主控因素及成藏模式、研究结果表明．神木气田具有“广覆式生烃、大面积成藏”的特点依据岩性圈闭与烃源岩的关系．将神木气田上古生界划分为源内式、近源式、远源式3个不同类型的成藏组合神禾气田上古生界太原组、山西组天然气的生成、运移及良好的储盖配置关系，为神木气田天然气的富集创造了优越的条件烃类早期注入为形成神木气田的有效储层提供了有利条件，而三角洲分流河道砂体控制了有效储层的展布、该研究可为神木气田下步勘探开发提供有力依据.

In recent years, a large number of natural gas exploration in the eastern part of the Shenmu gasfield in Ordos Basin has good potential for petroleum exploration and development. To guide the exploration and development in the Shanxi and Taiyuan Formations of Shenmu gasfiehl, tile authors studied characteristics of the natural gas source-reservoir-caprock assemblage （SRCA） forming in the Upper Paleozoic Permian Shanxi Formation and Taiyuan Formation gas reservoirs of Shemnu gasfield by using a large number of seismic data, outcrops, drilling, well logging, （borehole） log, analysis and test data, and so on. The authors discussed the main controlling factors and the models of the gas SRCA- forming. The study l^sults show that Shennm gasfieht has characteristics of ＂widespread distributing, hydrocarbon generation, anti SRCA-forming in a large area＂. Based on the relationship between lithologic traps anti source rock, the authors divide the Upper Paleozoie in the Shenmu gasfield into three types of SRCA, that is, intra-souree, near-source anti far -source. The formation and miga＇ation of natural gas in the Taiyuan Formation and Shanxi Fonnation of the Shenmu gasfield have created favorable conditions for the enrichment of natural gas in Shenmu gasfield. The early injection of hydroearhuns provides favorable conditions for the formation of effective reservoirs in the Shenmu gasfield, while the deha distributary channel sand bodies control the effective resezwoirs. The study （＇an provide a strong basis for the exploration and development of Shenmu gasfiehl.