渤海海域埕岛东坡东营组砂体成因及油气富集特征

doi:10.3969/j.issn.1672-7703.2020.04.004

摘要/Abstract

摘要： 埕岛油田是中国石化胜利油田分公司海上重要的增储阵地，埕岛东坡东营组勘探潜力大、勘探程度相对较低。该区砂体类型多样、分布难以预测、成藏富集差异大。为了明确该区砂体成因及油气富集主控因素，基于录井、测井、测试、地震等资料分析，对埕岛东坡东营组的沉积特征、成藏控制因素进行系统研究。研究结果表明: ①埕岛东坡主力含油层系Ed4 砂组主要发育洪水湖底扇和滑塌湖底扇沉积类型。②受古地貌和断裂坡折带控制，扇体主要沿北东向展布的多个继承性沟谷分布；多期发育的砂体互相叠置，沟谷间储层相对独立，坡折处多为砂体尖灭带。③构造因素与沉积体系配置决定了研究区主要发育构造—岩性油藏、岩性油藏，其中坡折带下方至洼陷带发育较大规模自生自储的岩性油藏。④深水环境下多期重力流砂体叠置发育，形成规模性储层，奠定了该区油气富集的基础。源储配置、断裂及超压决定了该区油藏具有叠合连片分布、普遍富集高产的特点。

关键词: 渤海海域, 埕岛东坡, 东营组, 坡折带, 湖底扇, 重力流, 岩性油藏

Abstract: The Chengdao oilfield is an important offshore area for reserves increase for Sinopec Shengli Oilfield Company. The Dongying Formation, in the east slope of the Chengdao area, has great potential and has so far been subject to relatively little exploration. The diversity of sand body types in this area makes it difficult to predict their distribution, and hydrocarbon accumulation and enrichment patterns are also extremely varied. This study examines the sedimentary characteristics and control factors of hydrocarbon accumulation in the Dongying Formation to determine the geneses of sand bodies and the main controlling factors of oil and gas accumulation in the area. Results from mud logging, wireline logging, well test, and seismic data show that: (1) The main types of sedimentary facies are the flood sub-lacustrine fans and slump sub-lacustrine fans of the Ed4 sand group of the major oil-bearing series in the east slope of the Chengdao area. (2) The fan bodies are oriented NE along several inherited gullies, controlled by paleogeomorphology and a fault slope break belt. Multi-stage sand bodies overlap each other. Between the gullies, sand reservoirs are relatively isolated. The slope breaks are mostly sand pinch-out zones. (3) The oil reservoirs in the study area are mostly structural-lithologic and lithologic reservoirs—a result of the good configuration relationships between structural factors and sedimentary systems. Large-scale self-generating and self-storage lithologic oil reservoirs are developed in the lower parts of slope breaks towards sag areas. (4) Oil and gas enrichment in the area, and the formation of large-scale reservoirs, are the results of superimposition of multi-stage gravity-flow sand bodies in a deep water environment. Source and reservoir assemblages, faults, and overpressure have ensured that the oil reservoirs in this area benefit for superimposed and contiguous distribution, general enrichment, and high production.

中图分类号:

宋明水. 渤海海域埕岛东坡东营组砂体成因及油气富集特征[J]. 中国石油勘探, 2020, 25(4): 31-42.

Song Mingshui. Sand body genesis and hydrocarbon accumulation characteristics of the Dongying Formation in the east slope of the Chengdao area, Bohai Sea[J]. China Petroleum Exploration, 2020, 25(4): 31-42.

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