天草凹陷下白垩统烃源岩的地球化学特征与凹陷含油气远景分析  

Geochemical Characteristics of Lower Cretaceous Source Rocks of the Tiancao Depression,Yingenejinaqi Basin, Northwest China and Its Petroleum Potential Analysis

作　　者：林卫东[1] 周永章[1] 郝银全[2] 李相博[3] 付善明[4] 

机构地区：[1]中山大学地球环境与地球资源研究中心,广州510725 [2]中国石油勘探开发研究院,北京100083 [3]中国科学院地质与地球物理所兰州分部,兰州730000 [4]中山大学 地球环境与地球资源研究中心,广州510725

出　　处：《矿物岩石地球化学通报》2005年第3期207-210,共4页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中国石油"十五"油气勘探科技工程资助项目(200204-06)

摘　　要：研究了下白垩统巴音戈壁组、苏红图组一段两套烃源岩的地质、地球化学特征以及烃源岩的热演化, 评价了天草凹陷的含油气远景。研究表明,巴音戈壁组烃源岩规模大,有机质丰度高,有机碳平均1.34%,以Ⅱ1型有机质为主,已经历成熟热演化阶段,其质量与二连等盆地相当。天草凹陷总生烃量为18.37×108t, 石油资源量为0.74×108t,发育断鼻、断块与岩性圈闭等构造。圈闭和烃源岩在时空上的匹配较好,表明石油地质条件较好,可作为同规模、低勘探程度的新区凹陷中的首选勘探对象。In order to evaluate the petroleum prospecting potential of the Tiancao depression, two set of source rocks from Bayingebi Formation and Suhongtu Formation of Lower Cretaceous respectively were collected for studying their geological and geochemical characteristics and thermal evolution history. Our research shows that the big volume source rocks in the Bayingebi Formation, containing average TOC of 1.34% and type Ⅱ 1 organic matter, had undergone mature thermal evolution stage with quality equivalent to that of of source rocks in the Erlian basin. The total amount of hydrocarbon resource in the Tiancao depression is 1,836.80 million ton and the total petroleum resource is 74 million ton. Fault nose, fault block and stratigraphic traps are developed with favorable structural conditions for trapping hydrocarbon and petroleum. These indicate that the Tiancao depression is a preferred petroleum exploration target among various new exploration areas.

关 键 词：天草凹陷 下自垩统 烃源岩 地球化学 含油气远景 

分 类 号：P618.13[天文地球—矿床学]