渤海湾盆地东营凹陷古近系深层油气成藏系统及勘探潜力

doi:10.11743/ogg20210601

摘要/Abstract

摘要：

东营凹陷是渤海湾盆地具有代表性的陆相断陷盆地，深部层系勘探程度低，丰深1、丰深斜101等井获得高产工业油气流，显示了良好的勘探潜力。以东营凹陷古近系深层为对象，在烃源岩分析基础上，结合优质储层成因研究，建立油气成藏模式，明确深层勘探潜力方向。结果表明：东营凹陷古近系深层的沙四下亚段及孔店组构成独立的含油气系统，孔二段、沙四下亚段发育的盐湖（咸化）环境烃源岩具有排烃时期早、排烃时间长、效率高、生排烃周期长的特点，为深层油气成藏系统提供了有利的油源条件；咸化湖泊的多类型沉积体经历了酸-碱交替的成岩流体环境，形成了以次生溶蚀孔隙为主的优质储层，为深层油气成藏提供了良好的储集条件；深层油气成藏系统的油气藏分布与断陷盆地结构、沉积储层发育和成藏动力系统具有良好的对应性，“自源型”及“他源型”油气成藏模式有序分布；缓坡带红层和滩坝砂岩及陡坡带砂砾岩等不同类型油气藏是东营凹陷古近系深层重要的勘探领域。

关键词: 油气成藏系统, 勘探潜力, 深层, 古近系, 东营凹陷, 渤海湾盆地

Abstract:

The Dongying Sag is a representative non-marine faulted depression in the Bohai Bay Basin. Two wells (FSh1 1 and FShX 101) drilled into the deep of the sag were tested with high rates of oil flow, revealing great exploration potential of deeper layers that have been relatively overlooked during years of intensive oil and gas exploration and development in the basin. This study, taking the deep Paleogene strata in the sag as an example, aims to assess the potential through oil and gas accumulation models established on analyses of source rocks and genesis of high-quality reservoirs in the sag. The results show that the Ek (Kongdian Formation) and lower Es⁴ layers in the deep Paleogene constitute on their own an independent petroleum system. The source rocks in the Ek² and lower Es⁴, developed in a saline lake (salinized) environment are characterized by an early, long and efficient hydrocarbon expulsion and a long hydrocarbon generation-expulsion cycle, providing key components for the formation of a deep petroleum system. The multi-type sedimentary facies of the saline lake have experienced alternative modification of acidic and alkaline diagenetic fluids, and formed high-quality reservoirs mainly composed of secondary dissolution pores, which provided good reservoir conditions for the deep hydrocarbon accumulation. The distribution of oil/gas reservoirs in the deep layers corresponds well to the structure of faulted depression, the development of sedimentary reservoirs and the dynamic system of hydrocarbon accumulation. The "indigenous" and "non-indigenous" hydrocarbon accumulation patterns are orderly distributed. Different types of oil/gas reservoirs, such as red beds and beach bar sandstone in gentle slope zone, as well as sandy conglomerate in steep slope zone, are the focus of exploration in the deep Paleogene of Dongying Sag.

Key words: hydrocarbon accumulation system, exploration potential, deep strata, Paleogene, Dongying Sag, Bohai Bay Basin

中图分类号:

TE122.3

宋明水,王永诗,郝雪峰,等. 渤海湾盆地东营凹陷古近系深层油气成藏系统及勘探潜力[J]. 石油与天然气地质, 2021, 42(6): 1243-1254. doi: 10.11743/ogg20210601 Mingshui Song,Yongshi Wang,Xuefeng Hao,et al. Petroleum systems and exploration potential in deep Paleogene of the Dongying Sag, Bohai Bay Basin[J]. Oil & Gas Geology, 2021, 42(6): 1243-1254. doi: 10.11743/ogg20210601

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层位		井号	岩性	有机质丰度指标			R_o/%	干酪根类型	综合评价	分布区域
层位		井号	岩性	TOC/%	氯仿沥青A含量/%	（S₁+S₂）/（mg·g^-1）	R_o/%	干酪根类型	综合评价	分布区域
沙四下亚段	上部	丰深1	钙质泥岩	0.30 ~ 3.50	0.30 ~ 0.90	0.90 ~ 8.20	0.90 ~ 1.30	Ⅱ₁-Ⅱ₂	成熟、优质烃源岩	民丰、利津
沙四下亚段	下部	丰深2	泥岩	0.30 ~ 0.80	0.10 ~ 0.20	0.20 ~ 0.90	1.10 ~ 1.30	Ⅱ₁-Ⅱ₂	高成熟、中等-差烃源岩	民丰、利津
孔二段		胜科1	灰黑色泥	0.07 ~ 0.94/0.41	0.01 ~ 0.07/0.02	0.04 ~ 0.27/ 0.05	4.14 ~ 4.17/4.12	Ⅰ-Ⅱ	过成熟、中等烃源岩	牛庄洼陷、石村地区
孔二段		王46	岩夹膏岩	0.05 ~ 1.16	-	0.01 ~ 0.15	0.96 ~ 1.25	Ⅰ，Ⅱ-Ⅲ	过成熟、中等烃源岩	牛庄洼陷、石村地区

井号	试油深度/m	构造位置	储集类型	油藏类型	油源	试油产量	原油性质
丰深1	4 316~4 313	陡坡带	砂砾岩	岩性	Es^4（上）	日产油81.7 t，日产气11.80×10⁴ m³	常规油、裂解气
新利深1	4 220~4 237	陡坡带	砂砾岩	构造-岩性	Es^4（下）	日产油99 t，日产气25.63×10⁴ m³	常规油、裂解气
丰深斜101	4 525~4 552	陡坡带	砂砾岩	岩性	Es^4（下）	日产油16.95 t，日产气3.06×10⁴ m³	凝析油气
高94	3 776~3 789	缓坡带	红层滩坝	构造-岩性	Es^4（上）	日产油5.75 t	常规油
樊154	3 500~3 522	缓坡带	滩坝	构造-岩性	Es^4（上）	日产油12.50 t	常规油
利67	4 007~4 092	缓坡带	滩坝	岩性	Es^4（上）	日产油83.40 t	常规油
高946	3 647~3 657	缓坡带	红层	构造-岩性	Es^4（上）	日产油18.30 t	常规油
高945	3 704~3 718	缓坡带	红层	构造-岩性	Es^4（上）	日产油7.84 t	常规油

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