北部湾盆地致密油气勘探新领域及资源潜力

doi:10.7623/syxb202501014

石油学报 ›› 2025, Vol. 46 ›› Issue (1): 205-219.DOI: 10.7623/syxb202501014

• 地质勘探 • 上一篇

北部湾盆地致密油气勘探新领域及资源潜力

邓勇^1,2, 胡德胜^2,3, 张建新², 周刚², 胡晨晖², 钟佳², 徐守立²

1. 油气资源与工程全国重点实验室, 中国石油大学(北京) 北京 102249;
2. 中海石油(中国)有限公司湛江分公司广东湛江 524057;
3. 中国地质大学(武汉)高等研究院湖北武汉 430074

收稿日期:2024-08-11 修回日期:2024-10-15 发布日期:2025-02-15
作者简介:邓勇,男,1975年9月生,2017年获中国石油大学(北京)博士学位,现为中海石油(中国)有限公司湛江分公司副总经理、总地质师、教授级高级工程师,主要从事海洋油气勘探研究与管理工作。Email:dengy@cnooc.com.cn
基金资助:
中国海洋石油集团有限公司"十四五"科技重大专项"地层岩性油气藏高效识别与精细评价技术"(KJGG2022-0303)、中国海洋石油有限公司综合科研项目"北部湾盆地页岩油资源评价与有利区带预测"(KJZH-2023-2106)和中海石油(中国)有限公司科技项目"'十四五’中海油矿业权区及周边空白区油气资源评价"(QGYQZYP2022-3)资助。

New exploration fields and resource potential of tight oil and gas in Beibu Gulf Basin

Deng Yong^1,2, Hu Desheng^2,3, Zhang Jianxin², Zhou Gang², Hu Chenhui², Zhong Jia², Xu Shouli²

1. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
2. Zhanjiang Branch, CNOOC China Limited, Guangdong Zhanjiang 524057, China;
3. Institute of Advanced Studies, China University of Geoscience(Wuhan), Hubei Wuhan 430074, China

Received:2024-08-11 Revised:2024-10-15 Published:2025-02-15

摘要/Abstract

摘要： 北部湾盆地是中国南海西部海域重要的油气勘探区和产区,近年来中—深层致密油气成为勘探新领域。为了落实致密油气的成藏及区域富集规律,指导后续的勘探开发,对北部湾盆地致密油气的烃源条件、储层特征及充注成藏模式开展研究,并总结了成藏规律。研究认为,多期构造运动控制了北部湾盆地的构造与沉积充填。古近系始新统流沙港组二段(流二段)油页岩以及中—深湖相泥岩为盆地最重要的烃源岩,流沙港组三段(流三段)也发育多套烃源岩。致密油气藏主要分布在涠西南凹陷、乌石凹陷流二段与流三段储层中,储集体类型以扇三角洲前缘水下分流河道、辫状河三角洲水下分流河道、滩坝为主。储层致密的主要成因是由于较高的地温梯度下埋藏深,压实作用与成岩作用强。致密储层的甜点分布于近洼早期超压与微裂缝发育区。致密油气藏主要发育3种成藏模式:近洼区"垂向倒灌式充注"、近洼区"侧向源-储对接连续式充注"、远洼区"垂向+侧向立体阶梯式充注",总体上呈近洼或沿鼻状构造带富集的特征。北部湾盆地涠西南凹陷与乌石凹陷东部的流三段、流二段致密油气藏是重要的勘探新类型和新领域,资源潜力可达2.1×10⁸m³。

关键词: 北部湾盆地, 致密油气, 成藏模式, 圈闭类型, 沉积储层, 资源潜力

Abstract: Beibu Gulf Basin is an important oil and gas exploration and production area in the western South China Sea. In recent years, the medium-deep tight oil and gas reservoirs have become new exploration targets. To determine the hydrocarbon accumulation and regional enrichment patterns of tight oil and gas and further guide subsequent exploration and development, the paper studies the hydrocarbon source conditions, reservoir characteristics, and accumulation models of tight oil and gas in Beibu Gulf Basin, and summarizes the accumulation rules. The study finds that multiple phases of tectonic movements play a role in controlling the structure and sedimentary filling of the basin. The oil shales and medium-deep lacustrine mudstones in Member 2 of the Eocene Liushagang Formation in Paleogene Period are the most important source rocks in the basin. Additionally, multiple sets of source rocks develop in Member 3 of Liushagang Formation. Tight oil and gas reservoirs are mainly distributed in Member 2 and 3 of Liushagang Formation in Weixinan sag and Wushi sag. The reservoir types are dominated by underwater distributary channels of fan deltas and braided river deltas, and beach-bar systems. The main reasons for the formation of tight reservoirs include strong compaction and diagenesis under high geothermal gradients due to deep burial. Sweet spots of tight reservoirs are distributed in areas with the development of early overpressure and microfractures adjacent to sags. There are mainly three tight oil and gas accumulation modes:"vertical downward filling" and "laterally continuous filling under source-reservoir contact mode" in zones near the sag, and "three-dimensional stepped vertical and lateral filling" in areas far from the sag. Overall, hydrocarbons are enriched near sags or along nose-like structural belts. The tight oil and gas reservoirs in Member 2 and 3 of Liushagang Formation in the eastern Weixinan sag and Wushi sag represent important new types and fields of exploration in Beibu Gulf Basin, where the resource potential amounts to 2.1×10⁸m³.

Key words: Beibu Gulf Basin, tight oil and gas, accumulation mode, trap types, sedimentary reservoir, resource potential

中图分类号:

TE132.2

邓勇, 胡德胜, 张建新, 周刚, 胡晨晖, 钟佳, 徐守立. 北部湾盆地致密油气勘探新领域及资源潜力[J]. 石油学报, 2025, 46(1): 205-219.

Deng Yong, Hu Desheng, Zhang Jianxin, Zhou Gang, Hu Chenhui, Zhong Jia, Xu Shouli. New exploration fields and resource potential of tight oil and gas in Beibu Gulf Basin[J]. Acta Petrolei Sinica, 2025, 46(1): 205-219.

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北部湾盆地致密油气勘探新领域及资源潜力

New exploration fields and resource potential of tight oil and gas in Beibu Gulf Basin

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