RELATIONS BETWEEN THE EARLY PERMIAN MAGMATIC ROCKS AND HYDROCARBON ACCUMULATION IN THE CENTRAL TARIM

Characteristics, distribution patterns and hydrocarbon accumulation relations of the Early Permian magmatic rocks in the Central Tarim have been studied with well geological data and core and rock testing and analysis information. Types, lithofacies, occurrences, development and distribution of the Early Permian magmatic rocks in the studied area are discussed in this paper. Relations between the hydrocarbon generation and accumulation and the Early Permian magmatic activity in the area are shown. The activity does not destroy oil and gas formation and accumulation, but is favorable for a large quantity of hydrocarbon to generate from source rocks, as the high thermal fluid brought by magma activity could increase ancient geothermal gradient, and accelerate the evolution history of source rocks. Also, magmatic activity could result in the formation of more channels for oil and gas migration and accumulation, and form many secondary pores and fissures. In addition, magmatic rocks could seal hydrocarbons in traps and pools.