银根-额济纳旗盆地油气地质特征及油气勘探方向

Petroleum Geological Characteristics and Prospecting Directions for Oil and Gas in Yingen-Ejinaqi Basin

银根-额济纳旗盆地是中新生界陆相盆地,前中生界构成盆地基底。晚三叠世进入了断陷盆地发育阶段,早白垩世为断陷盆地全面发展期,晚白垩世为坳陷期,其后表现为挤压抬升状态。发育中下侏罗统和下白垩统两个含油气系统,生、储、盖条件及其组合十分优越,勘探实践证实有过油气运聚,展示了盆地良好的油气勘探前景。目前需要抓住勘探重点,从有利区带和圈闭入手,注重湖相沉积演化的特点和岩浆岩对烃源岩演化及油气成藏的影响,寻找突破口,打开该区油气勘探的新局面。

Yingen-Ejinaqi Basin is a Mesozoic and Cenozoic lacustrine fault basin, and pre-Mesozoic constitutes its basement. The fault basin began in Late Triassic, and entered a completely developing period in early Cretaceous. Later it cames to a depression period in Late Cretaceous, and followed a long period of up-lifting afterwards. The basin develops aJurassic and a Lower Cretaceous petroleum systems, and have favorable source rocks, reservoir and seal combinations. Prospecting practice confirms the hydrocarbon generation and accumulation, and reveals a favorable prospecting. At present, the important things in prospecting are as follows: keeping on favorable oil accumulation belts and traps as main prospecting aims; concerning the evolution of lacustrine facies and the effects of magmatic rocks on hydrocarbon generation and accumulation especially. Only in this way could it have a breakthrough in oil prospecting in the area.