Hydrocarbon accumulation models and exploration direction inside the Hejian metamorphic buried hills in Raoyang sag

doi:10.3969/j.issn.1672-7703.2019.06.010

Abstract

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.

CLC Number:

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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