鄂尔多斯盆地志丹地区延长组深部长9油气藏成藏规律研究

Study on the hydrocarbon accumulation law of Chang-9 member of Yanchang Formation in Zhidan area,Ordos Basin

对鄂尔多斯盆地志丹地区上三叠统延长组深部长9油气藏的生烃潜力、沉积体系、储集条件、构造条件等进行了研究,对油气藏成藏规律进行了深入探讨,认为该区延长组深部具有较好的成藏条件,其成藏主要受烃源岩展布、沉积体系时空分布、优质砂体发育、鼻状隆起等因素的控制.同时指出,这几个因素的优化匹配是寻找延长组深部长9油层组岩性油藏突破的关键.

The hydrocarbon generation potential,the sedimentary systems,the reservoir conditions and the structural conditions of the Chang-9 reservoir were studied,and the results show that,there are favorable hydrocarbon accumulation conditions in Chang-9 member,and that the hydrocarbon accumulation is controlled mainly by the distribution of hydrocarbon source rock,the spatial and temporal distribution of sedimentary systems and the development degree of favorable sand rock and nose-shaped uplift.It is pointed out that the optimization matching of the control factors is the key to finding lithilogic reservoirs in Chang-9 member.