辽河断陷西部凹陷沙三段沉积相及相模式

辽河断陷西部凹陷沙三段沉积相及相模式

张震1,2，鲍志东1,2，童亨茂1,2，王勇3

1. 中国石油大学资源与信息学院，北京 102200；2. 中国石油大学油气资源与探测国家重点实验室，北京 102200；3. 中国石油大港油田博士后工作站，天津，300280

收稿日期:2009-09-20 修回日期:2009-09-20 出版日期:2009-09-20 发布日期:2009-09-20

Sedimentary Facies and Facies Model of the 3rd Member of Shahejie Formation in the Western Sag, Liaohe Fault Basin

ZHANG Zhen1,2，BAO Zhi-dong1,2，TONG Heng-mao1,2，WANG Yong3

1. School of Resources and Information, China University of Petroleum, Beijing 102200, China;2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102200, China;3. Working Station for Postdoctoral Scientific Research, PetroChina Dagang Oilfield Company, Tianjin 300280, China

Received:2009-09-20 Revised:2009-09-20 Online:2009-09-20 Published:2009-09-20

摘要/Abstract

摘要： 西部凹陷沙河街组三段沉积厚度大，分布范围广，是深层储层的重要组成部分。通过对沙三段岩芯、钻/测井和地震资料的研究，识别出冲积扇、扇三角洲、近岸浊积扇、远岸浊积扇、断槽重力流水道、滑塌浊积扇及湖泊等7种沉积相类型，其中扇三角洲和浊积扇中各砂体微相的相互重叠构成区内最好的储层；该区沙三段沉积时期主要发育5套沉积体系，以冲积扇-扇三角洲-湖底扇沉积体系为主；在沙三段早中期，湖盆为水进沉积序列，西斜坡发育的扇三角洲和远岸浊积扇的砂体逐渐东移，展布范围逐渐扩大，而东陡坡扇三角洲中各亚相相带逐渐变窄，近岸浊积扇砂体呈长条状展布；到沙三段晚期，湖盆为水退沉积序列，西斜坡砂体展布范围、砂体厚度基本继承了前期的特征，东陡坡扇三角洲内各亚相相带逐渐变宽，并且向湖盆凹陷中心推进；沉积相带展布与迁移特征反映了古地形、边界同生断层、湖平面的相对变化以及物源的供给量等因素对沉积格局的控制。

Abstract: The sandbodies in the 3rd Member of Shahejie Formation in Western Sag with a huge sedimentary thickness and a wide distribution are the most important reservoirs for petroleum accumulation in the deeply buried sequences in Liaohe basin. Based on core, drilling, logging and seismic data, seven types of sedimentary facies are identified in this area, i.e., alluvial fan, fan delta, beachy turbidite fan, off-shore turbidite fan, fault trough gravity flow channel, slump turbidite fan and lacustrine facies, in which the multistory sandbodies in the fan delta and turbidite fan comprise the best reservoirs in the area. Five sets of depositional system are mainly developed during the sedimentation of the 3rd Member of Shahejie Formation, with the alluvial fan-fan deltasublacustrine fan depositional system dominant; At the early-middle period of the 3rd Member of Shahejie Formation, the lake basin showed transgression depositional sequence. The sandbodies of fan delta and off-shore turbidite fan in western slope area gradually moved eastward and the distribution range expanded little by little, while in eastern steep slope area, the facies belts of each subfacies of fan delta narrowed down gradually and the sandbodies of beachy turbidite fan were distributed in belts; At the late period of the 3rd Member of Shahejie Formation, the lake basin showed dereliction depositional sequence. The distribution range and thickness of sandbodies in the western slope area succeeded the characteristics of the earlier period on the whole,however, the facies belts of each subfacies of fan delta in eastern steep slope area widened gradually and went forward to the center of depressed area of the lake basin; The features of distribution and migration of sedimentary facies belts indicate that the sedimentary framework was controlled by several factors, including palaeotopography, boundary growth fault, relative change of lake surface and provenance efficiency.

张震,鲍志东,童亨茂,王勇. 辽河断陷西部凹陷沙三段沉积相及相模式[J]. J4.

ZHANG Zhen1,2，BAO Zhi-dong1,2，TONG Heng-mao1,2，WANG Yong3. Sedimentary Facies and Facies Model of the 3rd Member of Shahejie Formation in the Western Sag, Liaohe Fault Basin[J]. J4.