东营凹陷“相-势”控藏作用原理分析及思索

Mechanism analysis on sedimentary facies and fluid potential controlling pool forming in Dongying Depression and its application speculation

伍松柏

Wu Songbai

中国海洋大学海洋地球科学学院, 山东青岛 266003; 中国石油化工股份有限公司胜利油田分公司地质科学研究院, 山东东营 257015

Ocean Geoscience Department of Ocean University of China, Qingdao 266003; Research Institute of Geological Sciences of SINOPEC Shengli Oilfield Company, Dongying 257015

根据东营凹陷洼陷带岩性油藏勘探形成的"相-势"控藏理论,结合国内外"相"、"势"控藏研究文献调研,对"相-势"控藏作用原理进行了解剖,并以东营凹陷陡坡带砂砾岩扇体为例进行"相-势"控藏作用研究,验证了北带砂砾岩体成藏受"相-势"控制,总结了东营北带的"相-势"控藏特征,完善和发展了"相-势"控藏理论。同时在研究中发现,由于油气成藏是一个动态过程,虽然现今储层有利相带及成藏动力的耦合是成藏的关键,但是研究证实储层的物性、地层压力的动态演化对圈闭含油气充满度影响很大。应对油气成藏关键时期及其以后的储层物性及地层压力分布规律及其动态演化进行研究,实现含油气盆地的构造演化史、沉积埋藏史、热演化史、成烃史、油气充注史、"相-势"控藏历史等的有机统一,进一步完善和发展"相-势"控藏理论,必将带来陆相断陷盆地油气勘探理论新的突破。

According to theory of sedimentary facies zone and fluid potential controlling pool forming established in stratigraphic reservoir exploration in low-lying belt of Dongying Depression, and combined with literature at home and abroad, mechanism of sedimentary facies and fluid potential controlling pool forming were aralyzed. Taking the glutenite body in abrupt slope belt of Dongying Depression as an example, the paper studied coupling effect of "facies-potential" upon reservoir forming. Result showed that reservoir forming process in glutenite body in north belt of Dongying Depression were controlled by coupling of "facies-potential". Characteristics of sedimentary facies and fluid potential were summarized, and the theory was developed and perfected accordingly. Study approved that reservoir forming is a dynamic process, coupling effect of favorable sedimentary facies and potential is the key factor, and evolution of reservoir property and formation pressure also have important influences upon fullness degree of an oil bearing trap. As a result, study should be carried out on distribution and dynamic evolution of reservoir property and formation pressure at and after critical period, so as to realize unification of tectonic evolution history, burial history, thermal history, hydrocarbon generation history, oil-gas incharge history and history of sedimentary facies and fluid potential controlling pool forming. This will further complement and develop the theory, and arose new break through in theory of petroleum exploration in continental faulted basin.