Deep self-source type hydrocarbon accumulation pattern and exploration practice in Dongying Sag

doi:10.3969/j.issn.1672-7703.2023.02.009

Abstract

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.

CLC Number:

TE111.1

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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