渤海湾盆地渤中凹陷大气田形成条件与勘探方向

doi:10.7623/syxb201811001

石油学报 ›› 2018, Vol. 39 ›› Issue (11): 1199-1210.DOI: 10.7623/syxb201811001

• 地质勘探 • 下一篇

渤海湾盆地渤中凹陷大气田形成条件与勘探方向

谢玉洪¹, 张功成², 沈朴², 刘丽芳², 黄胜兵², 陈少平², 杨树春²

1. 中国海洋石油集团有限公司北京 100010;
2. 中海油研究总院有限责任公司北京 100028

收稿日期:2018-08-21 修回日期:2018-09-20 出版日期:2018-11-25 发布日期:2018-12-10
通讯作者: 张功成,男,1966年1月生,1988年获西北大学学士学位,1994年获中国地质大学(北京)博士学位,现为中国海洋石油集团有限公司勘探专家、教授级高级工程师,主要从事海洋油气地质学研究。Email:zhanggch@cnooc.com.cn
作者简介:谢玉洪,男,1961年2月生,1982年获河北地质学院学士学位,2005年获中国地质大学(武汉)博士学位,现为中国海洋石油集团有限公司总地质师、教授级高级工程师,长期从事海洋油气勘探、开发、生产科研与管理工作。Email:xieyh@cnooc.com.cn
基金资助:
国家科技重大专项"中国近海富烃凹陷优选与有利勘探方向预测"（2016ZX05024-002）资助。

Formation conditions and exploration direction of large gas field in Bozhong sag of Bohai Bay Basin

Xie Yuhong¹, Zhang Gongcheng², Shen Pu², Liu Lifang², Huang Shengbing², Chen Shaoping², Yang Shuchun²

1. China National Offshore Oil Corporation, Beijing 100010, China;
2. CNOOC Research Institute Company Limited, Beijing 100028, China

Received:2018-08-21 Revised:2018-09-20 Online:2018-11-25 Published:2018-12-10

摘要/Abstract

摘要：

渤中凹陷是渤海湾盆地最富油、也最富气的凹陷，凹陷位于渤海海域中部，面积近9 000 km²，新生界厚度最大超过10 km，是渤海湾盆地面积最大、厚度最大的凹陷。渤中凹陷经历了古近纪断陷和新近纪区域拗陷两大阶段。古近纪断陷期双向伸展，形成"四洼一突"格局，断陷经历了由分隔洼陷到汇聚统一的演化过程；拗陷期持续沉降，形成古近系和新近系-第四系"双厚型"结构。渤中凹陷发育沙河街组三段、沙河街组一段及东营组三段3套优质烃源岩层系，优质烃源岩主要发育在沙河街组三段中-上部、沙河街组一段及东营组三段下部，上覆层巨厚，烃源岩演化程度高。基于统计分析重新构建了渤中凹陷不同层系烃源岩的生/排烃模型，从预测结果可以看出，渤中凹陷烃源岩排油量为512.5×10⁸m³、排气量为311.64×10¹¹m³。渤中凹陷潜山和孔店组储层油气源条件好，有近源特点。区域盖层为古近系下部厚层泥岩，成岩程度高、封堵能力强。潜山地层时代老、岩性硬、经历多期构造运动、裂缝发育、受强溶蚀、物性好、产量高，孔店组砂砾岩抗压实能力强。深层圈闭成群成带发育，规模大，勘探前景大，因此渤中凹陷深层具有形成大气田的条件，是发现大气田的有利领域。

关键词: 凹陷结构, 断陷, 洼陷, 天然气, 潜山, 渤中凹陷

Abstract:

Bozhong sag is not only the most oil-abundant but also the most gas-abundant sag in Bohai Bay Basin, which lies in the middle of Bohai region with an area of nearly 9 000 km² and a thickness of Cenozoic strata more than 10 km. It is the largest and thickest sag in Bohai Bay Basin. Bozhong sag experienced two stages, i.e., Paleogene fault depression and Neogene regional depression. During the stage of Paleogene fault depression, a bi-extension occurred to form a pattern of "four subsag with one uplift". The fault depression experienced an evolutionary process from several separated subsags into a whole. Continuous sedimentation led to the formation of Paleogene and Neogene-Quaternary "double-thickness" structure during the depression stage. There are three sets of source rock layers in Bozhong sag, i.e., Members 1 and 3 of Shahejie Formation and Member 3 of Dongying Formation (Sha 1, Sha 3 and Dong 3). High-quality source rocks are mainly developed in the middle and upper part of Sha 3, and the lower part of Sha 1 and Dong 3. Since the overlying layers are ultra-thick, there occurred the high evolution of source rocks. Based on statistical research, this study has established the hydrocarbon generation and expulsion models for different layers of source rock in Bozhong sag. As viewed from the predicted results, the source rock in Bozhong sag has large oil and gas discharge of 512.5×10⁸m³ and 311.64×10¹¹m³, respectively. Reservoirs of Kongdian Formation and buried hill in Bozhong sag present good hydrocarbon source conditions and locate in the near-source zone. The regional caprock of deep reservoir is the thick mudstone in Dongying Formation with a high degree of diagenesis and a strong blocking ability. The buried hill formations are characterized by old age, hard lithology, multiple tectonic movements, fissure development, strong corrosion, favorable property and high yield. The glutenite in Kongdian Formation has a strong anti-compaction property. Large groups of deep traps are developed, showing great prospects for exploration. Thus, deep reservoirs in Bozhong sag have the conditions to form large gas field, which are favorable areas for the discovery of large gas fields.

Key words: sag structure, fault, subsag, natural gas, buried hill, Bozhong sag

中图分类号:

TE121.1

谢玉洪, 张功成, 沈朴, 刘丽芳, 黄胜兵, 陈少平, 杨树春. 渤海湾盆地渤中凹陷大气田形成条件与勘探方向[J]. 石油学报, 2018, 39(11): 1199-1210.

Xie Yuhong, Zhang Gongcheng, Shen Pu, Liu Lifang, Huang Shengbing, Chen Shaoping, Yang Shuchun. Formation conditions and exploration direction of large gas field in Bozhong sag of Bohai Bay Basin[J]. Acta Petrolei Sinica, 2018, 39(11): 1199-1210.

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渤海湾盆地渤中凹陷大气田形成条件与勘探方向

Formation conditions and exploration direction of large gas field in Bozhong sag of Bohai Bay Basin

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