辽东湾南部东营组二段强制湖退沉积体的发现及其地质意义  

Discovery of a forced lacustrine regression system and its geological significance in Member 2 of Dongying Formation,the southern Liaodong Bay

作　　者：徐强[1] 陈桂华[1] 宋来明[1] 

机构地区：[1]中海石油研究中心

出　　处：《中国海上油气》2009年第2期75-80,共6页China Offshore Oil and Gas

基　　金：国家重大专项项目课题"近海富烃凹陷资源潜力再评价和新区;新领域勘探方向(2008ZX05023-01)"部分研究成果

摘　　要：辽东湾南部东营组二段下部发育一套斜交前积结构地层,通过单井精细沉积作用分析和三维地震资料综合解释与分析,认为该套沉积是一套强制湖退沉积体,主要由于东营组二段沉积时期湖平面强烈下降形成。强制湖退沉积体在区域上可以识别出6期三角洲前积体依次前积叠覆,并发育一系列下切谷,在三角洲前缘部位还发育滑塌沉积,但三角洲顶积层不发育,这些特征与国内外典型强制海退沉积体的表现特征非常相似。采用正演模拟方法对强制湖退沉积作用形成机制进行了分析。辽东湾南部东营组二段强制湖退沉积体的发现,有助于该地区东营组一段及东营组二段区域地层解释与对比,对于开拓该地区油气勘探思路和推动岩性地层油气藏勘探具有一定的战略意义。In the lower Member 2 of Dongying Formation, the southern Liaodong Bay, a set of diagonal progradation sediments is deposited, which has been considered as a forced lacustrine regression system produced mainly by a strong fall of lake level during deposition of the Member, through an analysis of refined sedimentation in singal wells and a comprehensive interpretation of 3D seismic. In the system, there are 6 deltaic progradational u- nits overlapped each other, a series of incised valleys and some slump sediments in delta fronts, with no topset developed. All these features are similar to those of typical forced marine regression systems at home and abroad. The mechanism to develop forced lacustrine regression systems is analyzed by using a method of forward modeling. This system discovery in Member 2 of Dongying Formation may help regional interpretation and correlation for Member 1 and 2 of the Formation, and is strategically important to opening exploration thoughts and promoting stratigraphic trap searches in the southern Liaodong Bay.

关 键 词：辽东湾南部 东营组二段 强制湖退沉积体 地质意义 

分 类 号：P512.2[天文地球—地质学] P618.130.2