柴达木盆地东部三湖地区第四纪沉积物源分析  

SOURCE ANALYSIS OF QUATERNARY SEDIMENTS IN THE SANHU AREA,EASTERN QAIDAM BASIN

作　　者：郭泽清[1] 孙平[1] 张林[1] 张绍胜[1] 田继先[1] 孔骅[1] 

机构地区：[1]中国石油勘探开发研究院廊坊分院天然气地质所,廊坊065007

出　　处：《第四纪研究》2010年第5期1044-1054,共11页Quaternary Sciences

基　　金：国家大型油气田及煤层气开发科技重大专项项目(批准号:2008ZX05007)资助

摘　　要：柴达木盆地三湖地区第四系的形成是在新近纪末期新构造运动作用下,盆地沉积中心由西向东整体迁移的产物。在第四系中发现了世界上最大的生物气田,近年来在寻找构造圈闭难以取得突破的情况下,岩性圈闭的勘探成为下一步勘探工作的必然选择。确定物源方向对岩性油气藏的勘探具有重要的指导作用。该文通过分析现今水系分布、储层岩性、矿物组合、氯离子含量、重矿物、泥质含量、砂岩含量、地震前积反射等特征和通过野外踏勘、储层反演等手段,确定三湖地区第四系沉积物源呈明显的不对称性,主要物源来自南部的昆仑山,次要物源来自北斜坡东部锡铁山-埃姆尼克山。The Quaternary in the Sanhu area of Qaidam Basin is the product of migration of the basin depositional center from west to east under the tectonic movements at the end of Tertiary. It has trapped the largest biologic gas field in the world. In recent years, the structural reservoir is difficult to be located, and so the lithologic reservoir is considered as the next exploration target. As to this point, ascertaining of the source direction of the Quaternary sediments is very important. Through the field survey, we found that the Quaternary sediments in the study area are apparently asymmetrical in distribution. And through analyses of water system, reservoir lithology, mineral assemblages,paleosalinity,heavy minerals,argillaceous content and sand content, and seismic reflection features as well as reservoir inversion, we further found that these sediments came from two sources. The main source is Kunlun mountains south of the basin,and the secondary source is the Xitie and the Aimunike mountains east of the northern slope of the basin. Finally,lt is believed that the Taidong nose-like structure should be a favorable target for the future exploration.

关 键 词：柴达木盆地 第四系 物源方向 岩性圈闭 

分 类 号：P941.75[天文地球—自然地理学]