东海陆架盆地东南部白垩系油气成藏条件

王明健; 肖国林; 张勇; 杨艳秋; 杨长清

doi:10.16562/j.cnki.0256-1492.2019070303

东海陆架盆地东南部白垩系油气成藏条件

1.
中国地质调查局青岛海洋地质研究所，青岛 266071

2.
海洋国家实验室海洋矿产资源评价与探测技术功能实验室，青岛 266071

基金项目: 国家自然科学基金项目“南黄海盆地中部隆起形成演化的低温热年代学制约”（41606079）；中国地质调查局地质调查项目（DD20160137，DD20190205，DD20190208，DD20190211）；中国地质调查局地质调查项目“东海陆架盆地西部坳陷带含油气远景调查评价”（1212010310403）

详细信息

作者简介: 王明健（1983—），男，博士，从事盆地构造与油气成藏研究，E-mail：wangmingjian0328@qq.com

通讯作者: 肖国林（1962—），男，博士，从事石油地质方面研究，E-mail：XGL253@163.com

中图分类号: P736

收稿日期: 2019-07-03

修回日期: 2019-07-27

刊出日期: 2019-12-25

Cretaceous hydrocarbon accumulation conditions in the southeastern East China Sea Shelf Basin

1.
Qingdao Institute of Marine Geology, CGS, Qingdao 266071, China

2.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

More Information

Corresponding author: XIAO Guolin, XGL253@163.com

Received Date: 03 July 2019

Revised Date: 27 July 2019

Publish Date: 25 December 2019

摘要

摘要:
目前东海陆架盆地的勘探形势良好，在新生界陆续发现多个油气田，但在盆地中生界尚未有大的勘探突破。为提高油气勘探效率，利用含油气系统的理论与方法对研究区白垩系油气成藏要素及成藏作用进行了分析，总结出了研究区油气成藏模式。结果表明：研究区白垩系烃源岩主要发育在基隆凹陷，岩性推测为海湾相暗色泥岩，有机质丰度高，类型好；储层主要为中―新生代砂岩，储集空间主要为原生孔隙和次生裂缝，白垩系砂岩整体为中孔中渗储层，新生界储集性能较好，并以始新统平湖组和渐新统花港组砂岩最为重要；中新生代盖层主要为泥岩，发育两套生储盖组合；受构造演化所控制，基隆凹陷可能经历了白垩纪晚期、古近纪、新近纪―至今3次生烃，其他地区只经历了后两次生烃；油气主要是通过优势输导砂体、不整合面、断裂和裂缝所组成的输导体系向周围圈闭运移；东海陆架东南部白垩系油气主要存在3种油气藏类型。本次研究结果可以为东海陆架盆地东南部白垩系的油气资源评估提供依据。
- 白垩系 /
- 生烃作用 /
- 成藏模式 /
- 东海陆架盆地 /
- 东南部
Abstract:
The exploration of oil and gas is very successful in the East China Sea Shelf Basin up to present. A number of oil and gas fields have been discovered in the Cenozoic, but no significant breakthrough has been made in the Mesozoic so far in this basin. In order to improve the efficiency of oil and gas exploration, we analyzed the Cretaceous hydrocarbon accumulation factors in the study area by using the theories and methods of petroleum system, which are summarized into a hydrocarbon accumulation model for the study area. The results show that the Cretaceous source rocks in the study area are mainly deposited in the Jilong Sag, dominated by dark mudstone of bay facies with high organic matter abundance as a good type of source rock. The reservoirs are mainly consisting of Mesozoic-Cenozoic sandstone, with primary pore and secondary fractures as the main reservoir space, and the Mesozoic sandstone has moderate porosity and permeability in general. The Cenozoic reservoirs have good performance, in which the sandstone of the Pinghu Formation in Eocene and Huagang Formation in Oligocene are the most important ones. The Mesozoic and Cenozoic caprocks are mainly mudstone. There are two sets of source-reservoir-cap assemblages. Controlled by tectonic evolution, the Jilong Sag may have experienced three periods of hydrocarbon generation, i.e late Cretaceous, Paleogene and Neogene-to-present, while other areas have only experienced two. Hydrocarbon conducting system is composed of sand bodies, unconformities, faults and fractures. There are mainly three types of hydrocarbon models in the Cretaceous of the southeastern East China Sea Shelf Basin. The results of this study have provided a basis for the evaluation of the Cretaceous oil and gas resources in the southeastern part of the East China Sea Shelf Basin.
- Cretaceous /
- hydrocarbon generation /
- hydrocarbon accumulation model /
- East China Sea Shelf Basin /
- southeastern part

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图 1 东海陆架中南部中生代构造区划略图

Figure 1.

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图 2 基隆凹陷地震剖面特征

Figure 2.

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图 3 东海陆架东南部白垩系暗色泥岩厚度等值线图

Figure 3.

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图 4 雁荡低凸起带FZ13井单井埋藏和热演化图

Figure 4.

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图 5 东海陆架盆地西部和东南部圈闭类型图（据文献[10]）

Figure 5.

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图 6 东海陆架东南部白垩系含油气系统事件图

Figure 6.

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图 7 东海陆架东南部白垩系成藏模式图

Figure 7.

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