扇三角洲层序地层特征及其油气汇聚规律——以东营凹陷胜北断层下降盘坨76块为例  

SEQUENCE STRATIGRAPHY OF A FAN-DELTA AND ITS IMPLICATIONS FOR OIL-GAS ACCUMULATION-A CASE OF THE T76 BLOCK ON THE DOWNTHROWN SIDE OF SHENGBEI FAULT IN DONGYING DEPRESSION

作　　者：刘阳 赵俊青 

机构地区：[1]中海油研究总院海外评价中心,北京100027

出　　处：《海洋地质前沿》2011年第11期18-24,共7页Marine Geology Frontiers

基　　金：国家"十五"科技攻关课题"济阳坳陷复杂隐蔽油气藏地质评价和勘探开发关键技术研究"(2001BA605A09)

摘　　要：以东营凹陷胜北断层下降盘坨76块沙四上亚段扇三角洲沉积体为例,通过地质、地震、测井等资料对其层序地层单元进行了精确划分对比,将坨76块沙四上亚段扇三角洲沉积体共划分为4个准层序,18个层组,29个单层,并研究了各准层序及其内部层组特征及分布规律。研究发现在扇三角洲沉积体系中准层序及层组边界在地层记录中的表现形式随地理位置而变化。在上述基础上,探讨了扇三角沉积体系中最基本的准层序和层组2级层序地层单元与油气汇聚的关系,研究发现在完全由一种相构成的准层序、层组基准面旋回中,孔隙度和渗透率是A/S值变化的函数,在准层序及层组内部随A/S的变化,储层物性及其含油饱和度呈现一定的变化规律。Taking the Tuo76 fan-delta of the upper part of the 4＇hmember of the Shahejie Formation on the downthrown side of the Shengbei fault in the Dongying depression as an example,this paper deals with the characteristics and distribution pattern of parasequnces in a fan-delta depositional system. Based on geological, seismic and well logging data, theTuo76 fan-delta is divided into 4 parasequnces, 18 bed sets and 29 beds. Our data show that the occurrence and boundaries of the parasequences and bed sets change with time. Oil-gas accumulation is related to the distribution of parasequnces and bed sets. The change in porosity and permeability of the reservoir is a function of A/S （Accommodation space/sediment supply） in the parasequenee and bed sets consisting of one facies. And reservoir properties and oil-gas saturation show similar pattern of variation.

关 键 词：扇三角洲 准层序 层组 油气汇聚 沙四上亚段 

分 类 号：TE121.34[石油与天然气工程—油气勘探]