东营北带中浅层油气运移通道网络及油气分布规律——以坨154块为例

Migration pathway network and distribution law of hydrocarbon in medium-shallow layers in the northern zone of Dongying:A case study from Tuo154 Block

油气运移的通道网络决定油气的分布规律及油气藏类型,因此,研究油气优势运移通道网络具有重要的现实意义。通过沉积、构造分析,认为研究区主要发育断层、砂砾岩扇体和不整合3种运移通道,构成了2种类型的网络,即断层-砂体运移网络和砂砾岩扇体-不整合-断层运移网络。利用油藏地球化学方法,选用原油物性和生物标志化合物2个参数,来追踪油气运移的优势通道网络,认为砂砾岩扇体-不整合-断层是坨154块的优势运移通道网络。这2种运移通道网络决定了区内主要发育构造-岩性和地层-岩性2类油气藏,油气具有"纵向运移距离远、横向展布范围呈环带状分布"的特点。

Migration pathway network determines the oil-gas distribution and the reservoir type, so it has great practical significance to study lhe predominant pathway network of oil and gas. Through the analysis of sedimentation and structure, the main migrationpathway of study area （：an t）e divided into three types： fault, glutenite fan and unconformity. They form two types of petroleum migration pathway networks, i.e. th, ult-sandbody imgration network and glutenite fan-uneonformity-fauh imgration network. By meansof resmwoir geochemistry, the oil property and biomarker are selected to trace the predominant pathway network of hydrocarbon migration. It is considered that glutenite fan-unconformity-fault is the predominant migration pathway network of Tuo154 Block.These two types of migration pathway networks determine that structural-lithologic reservoir and stratigraphic-lithologic reservoir are the main reservoir types. Hydrocarbon distribution is characterized by far imgration distance vertically and circle-beh distribution laterally.