成熟探区有效烃源岩的评价方法——以辽东湾地区为例

doi:10.7623/syxb201903001

石油学报 ›› 2019, Vol. 40 ›› Issue (3): 257-267.DOI: 10.7623/syxb201903001

• 地质勘探 • 下一篇

成熟探区有效烃源岩的评价方法——以辽东湾地区为例

金强¹, 侯庆杰^1,2,3, 程付启¹, 王世梁¹, 张如才⁴, 王飞龙⁴

1. 中国石油大学(华东)地球科学与技术学院山东青岛 266580;
2. 中国石油化工股份有限公司胜利油田分公司物探研究院山东东营 257022;
3. 胜利石油管理局博士后科研工作站山东东营 257000;
4. 中海石油(中国)有限公司天津分公司天津 300459

收稿日期:2018-05-14 修回日期:2018-12-22 出版日期:2019-03-25 发布日期:2019-03-29
通讯作者: 金强,男,1956年5月生,1982年获华东石油学院石油地质专业学士学位,1994年获石油大学(华东)矿产普查与勘探专业博士学位,现任为中国石油大学(华东)教授、博士生导师,主要从事油气地质科研与教学工作。Email:jinqiang@upc.edu.cn
作者简介:金强,男,1956年5月生,1982年获华东石油学院石油地质专业学士学位,1994年获石油大学(华东)矿产普查与勘探专业博士学位,现任为中国石油大学(华东)教授、博士生导师,主要从事油气地质科研与教学工作。Email:jinqiang@upc.edu.cn
基金资助:
国家科技重大专项（2016ZX05006-007）资助

Evaluation method of effective source rock in mature exploration area: a case study of Liaodong Bay

Jin Qiang¹, Hou Qingjie^1,2,3, Cheng Fuqi¹, Wang Shiliang¹, Zhang Rucai⁴, Wang Feilong⁴

1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
2. Geophysical Research Institute, Sinopec Shengli Oilfield Company, Shandong Dongying 257022, China;
3. Working Station for Postdoctoral Scientific Research, Shengli Oilfield, Shandong Dongying 257000, China;
4. Tianjin Branch, CNOOC China Limited, Tianjin 300459, China

Received:2018-05-14 Revised:2018-12-22 Online:2019-03-25 Published:2019-03-29

摘要/Abstract

摘要：

油气勘探成熟区预测资源量与勘探发现不符，问题可能在于有效烃源岩（特别是深层烃源岩）及其油气生成潜力没有得到正确地评价。在辽东湾地区，首先利用地球化学和地球物理手段对各凹陷中5套烃源岩进行了分层评价和油气生成模拟实验，计算得到油气生成强度；然后利用烃源岩埋藏过程中油气的生成模型、孔隙度变化模型及其油气饱和度，计算得到油气排出率，并根据烃源岩与砂岩的不同组合形式对油气排出效率进行校正，得到油气排出强度；最后将油气生成强度和排出强度与油气田储量规模进行了相关分析，根据相关性确定有效烃源岩的性质、分布以及对油气聚集的控制规律。结果表明，在辽东湾地区，生油强度大于25×10⁴t/km²（排油强度大于15×10⁴t/km²）的烃源岩可以形成储量规模大于500×10⁴t的油田，为有效烃源岩。其中，生油强度大于200×10⁴t/km²（排油强度大于125×10⁴t/km²）的烃源岩可形成储量规模大于5 000×10⁴t的油田，为优质烃源岩；而当生油强度低于25×10⁴t/km²（排油强度小于15×10⁴t/km²）时，没有规模储量的油气田，此类烃源岩为非有效烃源岩。与以往以有机碳含量的下限值分析为核心的有效烃源岩评价不同，这种利用油气生成强度和排出强度开展有效烃源岩评价的方法有利于推动中国东部成熟探区的油气精细勘探。

关键词: 生油气强度, 油气排出强度, 有效烃源岩, 评价方法, 辽东湾地区

Abstract:

There are contradictions between the discovered oil and gas reserves and the predicted resources in mature exploration area. It may be because the effective source rocks (including deeply buried source rocks)and their hydrocarbon generation potential are not properly evaluated. Different from the previous evaluations focusing on the minimum of TOC in effective source rocks, a new evaluation method of the resource rocks in Liaodong Bay is proposed in this study. In this area, using geochemical and geophysical methods, the stratified evaluation and hydrocarbon generation simulation experiments are conducted on five sets of source rocks in each depression, so as to calculate out the oil and gas generation intensity. Then, the hydrocarbon generation model, porosity variation model and oil saturation in the source rock burial process are applied to calculate out the oil and gas expulsion rate, and the oil and gas expulsion efficiency is corrected according to the different assemblages of source rock and sandstone, so as to obtain the oil and gas expulsion intensity. Finally, the correlation analysis is made between hydrocarbon generation intensity, expulsion intensity and oil and gas field reserves; on this basis, this study determines the nature and distribution of effective source rocks and the control laws of oil and gas accumulation. This study shows that in Liaodong Bay, the source rocks with the oil generation intensity greater than 25×10⁴t/km², i.e., the oil expulsion intensity greater than 15×10⁴t/km², can accumulate and be developed into the oil field with reserves greater than 500×10⁴t, which are deemed as effective source rocks. Among these, the source rocks with the oil generation intensity greater than 200×10⁴t/km², i.e., the oil expulsion intensity greater than 125×10⁴t/km², can accumulate to form the oil field with reserves greater than 5 000×10⁴t, which are considered as high-quality source rocks. If the oil generation intensity is less than 25×10⁴t/km² and the oil expulsion intensity is less than 15×10⁴t/km², the source rocks are defined as non-effective source rocks, where no oil fields have been discovered. The evaluation method using hydrocarbon generation intensity and expulsion intensity for effective source rocks is favorable for further fine oil and gas exploration in mature exploration areas of East China.

Key words: oil or gas generation intensity, oil or gas expulsion intensity, effective source rock, evaluation method, Liaodong Bay

中图分类号:

TE122.1

金强, 侯庆杰, 程付启, 王世梁, 张如才, 王飞龙. 成熟探区有效烃源岩的评价方法——以辽东湾地区为例[J]. 石油学报, 2019, 40(3): 257-267.

Jin Qiang, Hou Qingjie, Cheng Fuqi, Wang Shiliang, Zhang Rucai, Wang Feilong. Evaluation method of effective source rock in mature exploration area: a case study of Liaodong Bay[J]. Acta Petrolei Sinica, 2019, 40(3): 257-267.

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成熟探区有效烃源岩的评价方法——以辽东湾地区为例

Evaluation method of effective source rock in mature exploration area: a case study of Liaodong Bay

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