饶阳凹陷河间变质岩潜山内幕油气成藏模式与勘探方向

doi:10.3969/j.issn.1672-7703.2019.06.010

摘要/Abstract

摘要： 针对冀中坳陷变质岩潜山内幕油藏存在的储层类型多样、储层非均质性强、裂缝分布不清、成藏模式认识不清等问题，以饶阳凹陷河间变质岩潜山内幕为例，开展油源条件、岩石特征、储层物性特征、裂缝发育模式、储盖组合特征和油气成藏模式等相关研究。研究认为储层物性、储盖组合和成藏模式是变质岩潜山内幕油气成藏的关键因素。以钾长石、酸性长石和石英等浅色矿物为主要成分的花岗片麻岩裂缝发育，是有利储层形成的优势岩性。储层发育受岩性、构造作用和风化淋滤等因素控制，形成了风化壳裂缝溶蚀带、构造裂缝带和潜山内幕层状溶蚀带3 种储层分布模式，构建了潜山顶面风化壳、潜山内幕裂缝带与潜山内幕岩性层状3 种油气成藏模式，其中油气输导体系优越、储集空间发育的潜山内幕裂缝带成藏模式是有利的勘探方向。

关键词: 饶阳凹陷, 变质岩潜山, 潜山内幕, 成藏模式

Abstract: To investigate the types and heterogeneity of reservoirs, fracture distribution and hydrocarbon accumulation models inside the metamorphic buried hills in Jizhong depression, taking the Hejian metamorphic buried hills in the Raoyang sag as an example, studies have been carried out on the oil source conditions, rock characteristics, reservoir physical properties, fracture development, reservoir-caprock assemblages and hydrocarbon accumulation models. The results suggest that reservoir physical properties, reservoir-caprock assemblages and accumulation models are the primary factors controlling the hydrocarbon accumulation in the metamorphic buried hills. The granitic gneiss composed of light-colored minerals such as K-feldspar, acid feldspar and quartz has developed fractures and is the dominant lithology for forming favorable reservoirs. Controlled by lithology, tectonic action and weathering leaching, weathering crust fracture zones, tectonic fracture zones and stratiform dissolution zones are developed. As a result, there are hilltop weathering crust reservoirs, fracture reservoirs and stratiform lithologic reservoirs inside the buried hills. The fracture zone inside the buried hill with a good transport system and developed reservoir space is a favorable exploration target.

中图分类号:

李成海, 田建章, 金芳, 高园, 李晓燕, 卢永合, 赵铁东, 陈源裕, 王标. 饶阳凹陷河间变质岩潜山内幕油气成藏模式与勘探方向[J]. 中国石油勘探, 2019, 24(6): 781-790.

Li Chenghai, Tian Jianzhang, Jin Fang, Gao Yuan, Li Xiaoyan, Lu Yonghe, Zhao Tiedong, Chen Yuanyu, Wang Biao. Hydrocarbon accumulation models and exploration direction inside the Hejian metamorphic buried hills in Raoyang sag[J]. China Petroleum Exploration, 2019, 24(6): 781-790.

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