1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
2. Department of Geology, China University of Petroleum (Beijing), Beijing 102249, China
Abstract:Using latest seismic interpretation data, we analyze fold classification, morphological characteristics, the relation among folds, and spatial-temporal characteristics of extensional, and discuss strike-slip fault related folds, and fault related folds of hydrocarbon accumulation combining recent exploration practices. The results show that extensional fault related folds are different from strike-slip fault related folds in morphological characteristics, development process, and genetic mechanism, while there are still some relations between each other. Different evolutionary phases of the same fault can form different related folds. Different types of folds can transform each other and stack. The spatial and temporal distribution characteristics of fault-related folds are closely related on the evolution phases of faults: In the time domain, Paleogene mainly develop extensional fault related folds, and Neogene mainly develop strike-slip fault related folds. And in the space extensional fault related folds are widely distributed in the whole basin, and strike-slip fault related folds are zonal distribution. On the horizon, Kongdian-Dongying formation mainly develops extensional fault related folds, Minghuazhen formation-Quaternary mainly develops strike-slip fault related folds. Extensional and strike-slip fault related folds can form excellent trap conditions, and promote oil and gas migration. But strike-slip fault related folds may lead to the delay of hydrocarbon generation and expulsion in local area, resulting in late hydrocarbon accumulation in shallow horizons.
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