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

Deng Yong; Hu Desheng; Zhang Jianxin; Zhou Gang; Hu Chenhui; Zhong Jia; Xu Shouli

doi:10.7623/syxb202501014

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

更新时间：2025-10-10

- New exploration fields and resource potential of tight oil and gas in Beibu Gulf Basin
- ACTA PETROLEI SINICA Vol. 46, Issue 1, Pages: 205-219(2025)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.7623/syxb202501014
  CLC： TE132.2
- Published Online：15 February 2025，
  
  Published：2025
- 稿件说明：
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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, et al. New exploration fields and resource potential of tight oil and gas in Beibu Gulf Basin[J]. Acta petrolei sinica, 2025, 46(1): 205-219.
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. DOI： 10.7623/syxb202501014.

Deng Yong, Hu Desheng, Zhang Jianxin, et al. New exploration fields and resource potential of tight oil and gas in Beibu Gulf Basin[J]. Acta petrolei sinica, 2025, 46(1): 205-219. DOI： 10.7623/syxb202501014.

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2.1×10

。

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 t

he 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 2.1×10

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