鄂尔多斯盆地镇泾地区中生界油气成藏主控因素分析

Analysis of main control factor of Mesozoic oil and gas accumulation in Ordos Basin of Zhenjing region

在镇泾地区已探明油藏特征及邻区西峰油田的基础上,从研究区中生界构造、烃源岩、砂体展布特征等成藏控制因素进行综合分析,认为该区中生界烃源岩厚度总体上较邻区西峰油田差,油气纵向上运移动力不足。构造反转对油气成藏没有明显影响,但其形成的构造特征对局部成藏有控制作用。优势相与含油气性的好坏有关,但不是成藏与否的决定因素砂体与区内微构造叠合部位形成的圈闭应该是油气有利聚集地区,圈闭才是控制研究区成藏的关键因素。

Based on the characteristics of proven oil reservoir and Xifeng Oilfield,this paper analyzes the control factor of oil and gas reservoir-forming,including Mesozoic tectonic evolution and source rock and sedimentary.On the whole,the thickness of Zhenjing source rock is worse than that in Xifeng Oilfield,the dynamic of vertical migration is not enough,the structure overturn does not influence on the oil and gas reservoir-forming,but the formed characteristic of structure controls oil and gas reservoir.Although the conditions of hydrocarbon supply and petrophysical paoperty are related with predominace sedimentary face,it is not the main control factor.The overlap of sand bodies and mini structure form the trap which should be the better zone of oil and gas accumulation From the above points,the author considers the trap is the key controlling factor.