塔里木塔中地区二叠纪岩浆岩特征及其对油气成藏意义初探

Characteristics of the Permian Magmatic Rocks and Their Hydrocarbon Accumulation Significance in the Central Tarim

本文利用钻井地质资料和岩心测试分析结果 ,研究了塔里木盆地塔中地区二叠纪岩浆岩岩类、岩相、产状、发育与分布等特征和规律 ;初步探讨了本期岩浆活动对油气形成与成藏的意义 ,认为早二叠世岩浆活动有利于增加和改善油气运移的通道 ,能使烃源岩在短期内经历异常高温而成熟并增加生烃量 。

Characteristics, distribution patterns and hydrocarbon accumulation significance of the Permin magmatic rocks in the Central Tarim have been studied by applying the well geological data and the core testing and analysis information. The types, lithofacies, occurrences, development and distribution of the Paleozoic magmatic rocks in the studied area were discussed in this paper. The study showed the hydrocarbon generation and accumulation significance of the early Permian magmatic activity in the area. The activity did not destroy oil and gas formation and accumulation, and was favorable to that a large quantity of hydrocarbon were generated from the source rocks ealier, as the high thermal fluid which was brought by the magma activity could increase the ancient geothermal gradient, and accelerate the evolution history of source rocks. Also, the magmatic activity could result in formation of more channels of migration and accumulation of oil and gas, could form many secondary pores and fissures of reservoir rocks. In addition, the magmatic rocks could seal the hydrocarbons in the traps and pools.