层序地层地球化学方法在烃源岩评价中的应用——以海拉尔盆地贝尔凹陷为例

doi:10.11743/ogg20150422

石油与天然气地质 ›› 2015, Vol. 36 ›› Issue (4): 701-710.doi: 10.11743/ogg20150422

• 技术方法 • 上一篇

层序地层地球化学方法在烃源岩评价中的应用——以海拉尔盆地贝尔凹陷为例

吴文祥^1,2, 张海翔^1,2, 李占东^1,2, 梁鹏¹, 刘赛¹, 李萌¹, 鲍储慧¹

1. 东北石油大学石油工程学院, 黑龙江大庆 163318;
2. 东北石油大学提高油气采收率教育部重点实验室, 黑龙江大庆 163318

收稿日期:2014-08-18 修回日期:2015-05-10 出版日期:2015-08-08 发布日期:2015-08-28
第一作者简介:吴文祥(1961—),男,教授、博士生导师,油藏描述及化学驱研究。E-mail:yiliu_0925@163.com。
基金项目:
中国石油科技创新基金项目(2011D-5006-0101);东北石油大学研究生创新科研项目(YJSCX2015-011NEPU)。

Sequence stratigraphic geochemistry and its application in evaluation of source rocks:taking Beier sag of Hailar Basin as an example

Wu Wenxiang^1,2, Zhang Haixiang^1,2, Li Zhandong^1,2, Liang Peng¹, Liu Sai¹, Li Meng¹, Bao Chuhui¹

1. Institute of Petroleum Engineering, Northeast Petroleum University Daqing, Heilongjiang 163318, China;
2. Key Laboratory of Ministry Education for Improving Oil and Gas Recovery, Northeast Petroleum University, Daqing, Heilongjiang 163318, Chaina

Received:2014-08-18 Revised:2015-05-10 Online:2015-08-08 Published:2015-08-28
Contact: 张海翔(1985—),男,博士生,油藏描述及化学驱研究。E-mail:dqpi2014@163.com。 E-mail:dqpi2014@163.com

摘要/Abstract

摘要：

贝尔凹陷是海拉尔盆地富油凹陷之一，其中SQ2层序湖侵体系域发育的暗色泥岩、泥灰岩、油页岩和含钙泥岩沉积组合是优质烃源岩，但此前一直被忽视。依据实测有机碳含量（TOC）、氯仿沥青“A”含量、生烃潜量（S₁+S₂）、镜质体反射率（R_o）以及测井曲线预测的有机碳含量，运用层序地层地球化学分析方法，在层序格架内对贝尔凹陷烃源岩进行了精细研究，明确了主力烃源岩和优质烃源岩的发育层序（体系域）和规模，并计算了主力源岩和优质源岩的生烃与排烃量。研究认为，贝尔凹陷SQ2和SQ3层序烃源岩TOC、氯仿沥青“A”与S₁+S₂多数达到好源岩级别以上，偏油性有机质所占比重较大，是研究区的主力烃源岩；主力烃源岩内部非均质性较强，优质烃源岩主要发育在湖侵体系域和高位域的早期，SQ2层序的湖侵体系域优质烃源岩最为发育。生烃与排烃量计算结果表明，SQ2层序生油与排油量占绝对优势，并且其内部的优质烃源岩对生油、排油量的贡献比例分别高达84%和93%。结合油源对比研究，认为SQ2层序的优质烃源岩是凹陷内主力的烃源岩。运用层序地层地球化学方法对烃源岩评价，可以指导勘探程度较高的区块油气勘探，同时对勘探程度低、钻井少、源岩取样少的含油气盆地的烃源岩评价工作更为有效。

关键词: 优质烃源岩, 测井, 地球化学, 贝尔凹陷, 海拉尔盆地

Abstract:

Beier sag is one of the prolific sags in Hailar Basin.However, the significance of high quality source rocks consisting of dark mudstone, marl, oil shale and calcareous mudstone, developed in the SQ2 sequence of the transgressive system tract in the sag, had been overlooked in previous studies.Based on various data including the measured TOC, content of the chloroform asphalt “A”, hydrocarbon generation potential(S₁+S₂), vitrinite reflectance, as well as TOC from log interpretation, a detailed study of the source rocks was carried out in the context of sequence stratigraphic framework by using the geochemical-sequence analysis method to identify and evaluate the system tracts in which the major and quality source rocks had dwelled and calculate the amount of hydrocarbon generation and expulsion of the source rocks.The results show that most indexes including TOC, chloroform bitumen “A”, S₁+S₂, and etc., indicate that the source rocks in SQ2 and SQ3 are good to excellent in quality and dominated by oil-prone organic matter, meaning the two sequences are the major source rocks in the sag.The major source rocks are strongly heterogeneous and the high-quality source rocks were mainly developed in transgressive system tracts and early stage high stand system tracts(especially in SQ2).Calculation of hydrocarbon generation and expulsion from the source rocks shows that the source rocks in SQ2 contributed the most with hydrocarbon generation amount accounting up to 84% of the total and hydrocarbon expulsion amount accounting up to 93% of the total.The SQ2 was therefore considered the most promising home for source rocks in the sag.Evaluation of source rocks wiith geochemistry method can be used not only to guide exploration in brown blocks but also to improve working efficiency of source rock evaluation of green blocks with rare wells and samples.

Key words: high-quality source rocks, logging, geochemistry, Beier sag, Hailar basin

中图分类号:

TE112.1

吴文祥,张海翔,李占东,等. 层序地层地球化学方法在烃源岩评价中的应用——以海拉尔盆地贝尔凹陷为例[J]. 石油与天然气地质, 2015, 36(4): 701-710. doi: 10.11743/ogg20150422 Wu Wenxiang,Zhang Haixiang,Li Zhandong,et al. Sequence stratigraphic geochemistry and its application in evaluation of source rocks:taking Beier sag of Hailar Basin as an example[J]. Oil & Gas Geology, 2015, 36(4): 701-710. doi: 10.11743/ogg20150422

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层序地层地球化学方法在烃源岩评价中的应用——以海拉尔盆地贝尔凹陷为例

Sequence stratigraphic geochemistry and its application in evaluation of source rocks:taking Beier sag of Hailar Basin as an example

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