东营凹陷深层自源型油气成藏模式与勘探实践

doi:10.3969/j.issn.1672-7703.2023.02.009

摘要/Abstract

摘要： 东营凹陷深层是以“红层”为典型特征的沙河街组四段下亚段（沙四下亚段）—孔店组，该套层系沉积厚度大、储量发现少，蕴含着极大的勘探潜力。综合深层烃源岩评价、高成熟油源对比及自源型油气成藏模式的系统分析，明确了深层沙四下亚段和孔店组二段（孔二段）两套烃源岩的基本特征，落实了深层的资源潜力，同时深入剖析关键成藏要素条件，建立了自源型差异油气成藏模式。研究表明，深层孔二段烃源岩有机质类型为Ⅱ₁—Ⅲ型，评价为过成熟中等烃源岩；沙四下亚段烃源岩有机质类型为Ⅰ—Ⅱ₁型，评价为成熟优质烃源岩。利用原型盆地的井—震追踪落实烃源岩展布，进而评价出深层资源量为11.35×10⁸t。同时，建立了两种自源型油气藏的差异成藏模式，一种是陡坡带沙四下亚段烃源岩直接对接深层砂砾岩储层，匹配形成凝析油气—常规油的纵向有序油气藏；另一种是南部斜坡带孔店组源内的“源—断—储—圈”差异油气运聚模式。分析认为，基于东营凹陷深层烃源岩品质与规模的深化认识，以及两种自源型油藏模式的认识可将勘探目的层至少下探1500m，初步估算新增圈闭资源量近2×10⁸t，东营凹陷深层自源型油藏预计在“十四五”期间迎来重大突破。

关键词: 沙四下亚段—孔店组, 深层, 自源型油藏, 油气藏模式, 东营凹陷, 勘探实践

Abstract: In Dongying Sag, a typical “red bed” is developed in the deep formation, lower sub member of the fourth member of Shahejie Formation-Kongdian Formation (Es₄^x-Ek₂), which has a large thickness but few discovered reserves, showing a great exploration potential.Based on the comprehensive evaluation of deep source rocks, high mature source rock-oil correlation and systematic analysis of self-source type hydrocarbon accumulation pattern, characteristics of two sets of source rocks in Es₄^x-Ek₂ are determined, and resource potential in the deep formation is identified. In addition, the self-sourced differential hydrocarbon accumulation pattern is established by deeply analyzing the key elements of hydrocarbon accumulation. The study results show that Ek₂ source rock is dominated by Type Ⅱ₁ -Ⅲ organic matter, which is over-mature medium source rock, and Es4x source rock is Type Ⅰ-Ⅱ₁ organic matter, which is a set of mature high-quality source rock. The wellseismic tracking of the prototype basin is used to identify the lateral distribution of source rocks, and the estimated resources are 11.35×10⁸t in deep formations. In addition, two types of differential hydrocarbon accumulation patterns are established. One is a vertically ordered condensate gas-conventional oil reservoir formed by direct connection between Es₄^x source rock and deep glutenite reservoir in the steep slope zone. The other is the “source rock-fault-reservoir-trap” differential hydrocarbon migration and accumulation pattern within Ek₂ source rock in the southern slope zone. Based on the deepening understanding of the quality and scale of deep source rocks in Dongying Sag, as well as the two self-sourced hydrocarbon accumulation patterns, the exploration target can be extended down at least 1500m, and the preliminarily estimated new addition trap resources are nearly 2×10⁸t. A major breakthrough is expected in the deep self-sourced oil reservoir in Dongying Sag during the 14^th Five-Year Plan period.

中图分类号:

TE111.1

杨怀宇, 张鹏飞, 邱贻博, 巩建强, 韩同欣. 东营凹陷深层自源型油气成藏模式与勘探实践[J]. 中国石油勘探, 2023, 28(2): 92-101.

Yang Huaiyu, Zhang Pengfei, Qiu Yibo, Gong Jianqiang, Han Tongxin. Deep self-source type hydrocarbon accumulation pattern and exploration practice in Dongying Sag[J]. China Petroleum Exploration, 2023, 28(2): 92-101.

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