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
Petroleum systems and exploration potential in deep Paleogene of the Dongying Sag, Bohai Bay Basin
- 2021年42卷第6期 页码:1243-1254
收稿:2020-03-27,
修回:2021-10-06,
纸质出版:2021-12-01
DOI: 10.11743/ogg20210601
移动端阅览
收稿:2020-03-27,
修回:2021-10-06,
纸质出版:2021-12-01
移动端阅览
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。
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 E
k
(Kongdian Formation) and lower E
s
4
layers in the deep Paleogene constitute on their own an independent petroleum system. The source rocks in the E
k
2
and lower E
s
4
, 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.
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