地球物理学进展 ›› 2014, Vol. 29 ›› Issue (6): 2745-2753.doi: 10.6038/pg20140641

• 应用地球物理 • 上一篇    下一篇

雅布赖盆地萨尔台凹陷烃源岩地球化学特征、成熟度演化与油气关系

田涛1, 任战利1, 马国福2, 张睿胜2, 杨智明2, 郭科1, 董欣1   

  1. 1. 西北大学大陆动力学国家重点实验室, 西安 710069;
    2. 中石油玉门油田分公司, 酒泉 735000
  • 收稿日期:2014-03-12 修回日期:2014-10-10 出版日期:2014-12-20 发布日期:2014-12-20
  • 通讯作者: 任战利, 男, 1961年生, 研究员, 博士生导师, 西北大学地质学系, 主要从事沉积盆地构造热演化、油气地质等方面的教学与科研工作.(E-mail:renzhanl@nwu.edu.cn) E-mail:renzhanl@nwu.edu.cn
  • 作者简介:田涛, 男, 1987年生, 博士研究生, 西北大学地质学系, 沉积学、构造地质学方向.(E-mail:tiantao_870211@163.com)
  • 基金资助:

    国家自然科学基金(41372128)资助.

The relations of hydrocarbon generation to the geochemical features and maturity evolution of source rocks in Sartai Sag, Yabrai Basin

TIAN Tao1, REN Zhan-li1, MA Guo-fu2, ZHANG Rui-sheng2, YANG Zhi-ming2, GUO Ke1, DONG Xin1   

  1. 1. State Key Laboratory of Continental Dynamics Department of Geology, Northwest University, Xi'an 710069 Shannxi, China;
    2. PetroChina Yumen Oilfield Company, Jiuquan 735000, China
  • Received:2014-03-12 Revised:2014-10-10 Online:2014-12-20 Published:2014-12-20

摘要:

基于大量地球化学参数精细描述,利用热演化模拟技术,分析雅布赖盆地萨尔台凹陷中侏罗统烃源岩地球化学特征、成熟度演化及其与油气的关系.分析结果表明:①凹陷沉积中心,J2q以中-高成熟Ⅲ型烃源岩为主,埋藏深度大,可成为潜在有利气源;J2x1为Ⅱ2-Ⅲ型中成熟中-好烃源岩,为有利油源区;②斜坡带,J2q、J2x1分别为Ⅰ-Ⅲ混合、Ⅱ1-Ⅱ2型中成熟中-好烃源岩,为有利油源区;③黑沙低凸起,各组烃源岩有机质丰度较低,生油潜力一般,但构造位置有利于形成背斜圈闭油藏.J2x2为差生油岩,普遍分布萨尔台凹陷全区,且热演化程度低,只能作为下部油(气)源经垂向运移后的储集体.中侏罗世早期(180.0 Ma)至晚侏罗世末期(140.0 Ma),J2q、J2x1烃源岩快速经历了多阶段演化并达到中高热演化程度,是有机质大量向油气转化的关键阶段.另外,早白垩世末(100.0 Ma)斜坡带达到最大埋深,成为该区域烃源岩成熟演化的第二个关键时期.

Abstract:

Based on the description of a large number of geochemical parameters and thermal evolution simulation technique, the geochemical features and maturity evolution of Middle Jurassic source rocks in Sartai Sag,Yabrai Basin, and its relationship with hydrocarbon accumulation, were analyzed. The analysis results show that ①Depression center: The source rocks from J2q are mainly type Ⅲ in middle-high mature stage, and it can be a potential gas source because of the large buried depth. And that from J2x1 are generally medium-good source rocks in medium-high maturity(mostly type Ⅱ2-Ⅲ),can be a good oil source.②Slope area: The medium-good source rocks from J2q (mixed type Ⅰ-Ⅲ)and J2x1 (mostly type Ⅱ1-Ⅱ2) are both in medium-high maturity, can be a good oil source also. ③Heisha low uplift: The source rocks from each atrata have a poor oil-generating potential because of the low abundance of organic matter,but the tectonic position is advantageous to the formation of anticline trap reservoir. The source rocks from J2x2 are generally poor with low mature that it only can be as the reservoir of oil and gas from the lower strata after vertical migration. The source rocks from J2q and J2x1experienced a very fast process of maturity evolution and achieved to the mature stage during the early stage of Middle Jurassic(180.0 Ma) to the end of Late Jurassic(140.0 Ma), and it was the critical stage of hydrocarbon generation. In addition, the slope areas reached the largest buried depth in the late Early Cretaceous and it was the second critical period of hydrocarbon generation in slope areas.

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