Unconformity Type and Its Significance in Petroleum Geology

Abstract

Abstract: Various unconformities can be classified into such seven types of unconformities by conformation and mechanism as parallel, truncation, overlap, fold, faulted-fold, extensional and growth ones. Vertically, rocks near the unconformity appear layers which are in turn semi-weathering rock, weathering clay bed and basal conglomerate. The unconformity plays important roles on the migration and accumulation of hydrocarbons in nature as a pathway for long-distance petroleum migration. And paleo-weathering crust or palaeokarst belt take the part of improvement of reservoir quality of rocks, forming unconformity reservoirs. However, the unconformity may cause caprock damage and affect the maturity of hydrocarbon source rocks.

Key words: unconformity, type, structure, hydrocarbon migration, hydrocarbon accumulation

CLC Number:

TE112.12

YIN Wei, CHEN Zhao-nian, XU Hao, SI Yu-mei. Unconformity Type and Its Significance in Petroleum Geology[J]. Xinjiang Petroleum Geology, 2006, 27(2): 239-241.

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