青藏高原东北缘贵德坳陷烃源岩时代及勘探潜力  

Age of Hydrocarbon Source Rocks in the Guide Depression,Northeast Margin of Tibetan Plateau,and Its Exploration Potential

作　　者：马新民[1] 张跃中[2] 张弘强 周苏平[2] 李永奎[2] 张红欣[2] 

机构地区：[1]中国石油勘探开发研究院西北分院,兰州730020 [2]中国石油青海油田公司勘探开发研究院,甘肃敦煌736202 [3]中国石油东方地球物理公司,河北涿州102800

出　　处：《地质学报》2013年第1期133-138,共6页Acta Geologica Sinica

基　　金：中国石油天然气股份有限公司重大科技项目"柴达木盆地油气勘探开发关键技术研究"(编号11-01Z-01-04)资助成果

摘　　要：青藏高原东北缘贵德坳陷发育一套烃源岩,长期以来,其时代归属不统一,其生烃能力认识不清,制约了该坳陷油气资源勘探的进程。本文通过野外踏勘、露头剖面实测和样品分析及连续电磁剖面(CEMP)测量结果得出以下认识:①根据沉积特征及孢粉组合,结合区域地质资料,确定了该套地层形成时代为早白垩世,沉积环境为浅湖—半深湖;②借助野外实测剖面及连续电磁剖面(CEMP)资料,确定了该套烃源岩的发育规模;③通过对剖面样品的有机质丰度、热演化程度等实验分析,对该套烃源岩的油气勘探潜力进行了综合评价,认为该套烃源岩分布范围广,厚度大,有机质丰度高,热演化程度适中,可以作为贵德坳陷的有效烃源岩,提升了贵德坳陷油气勘探潜力;④利用野外调查结果及连续电磁剖面(CEMP)资料对贵德坳陷生储盖组合进行综合分析,并指出了有利的勘探方向。A set of hydrocarbon source rock developed within the Guide depression,but its age assignment has long been in dispute and hydrocarbon production capacity has not been understood.This has been restricting the development of oil and gas resources exploration in this area.Based on the field reconnaissance,outcrop measurement,continuous electromagnetic profile（CEMP） and sample analysis,the paper draws the conclusion as follows：（1） Based on sedimentary characteristics and sporo-pollen assemblage,combined with the regional geology data,the hydrocarbon source rock should formed at theEarly Cretaceous in the shallow lake or semi-deep lake sedimentary environments.（2） The scale of hydrocarbon source rock was determined using the data from outcrop measurement and continuous electromagnetic profile（CEMP）.（3） Through experiments such as organic abundance and thermal evolution degree,comprehensive evaluation on exploration potential of the hydrocarbon source rock was carried out.The study suggests that the hydrocarbon source rocks is extensive in distribution,huge in thickness,high abundance in organic matter,and moderate in thermal evolutionary degree,and can be considered as the effective source rock,thus improving gas and oil exploration potential in the Guide depression.（4）Finally,based on the field investigation and continuous electromagnetic profile data（CEMP）,the paper comprehensively analyzed source-reservoir-cap assemblage and then pointed out the favorable exploration direction.

关 键 词：烃源岩 时代厘定 勘探潜力 贵德坳陷 青藏高原东北缘 

分 类 号：P618.13[天文地球—矿床学]