塔北隆起二叠纪岩浆岩产状的地震解释及其侵位模式

塔北隆起西部发育大面积岩浆岩,岩浆岩发育产状的研究不仅对岩浆岩油气藏勘探具有重要意义,而且对塔北隆起碳酸盐岩油气藏研究具有重要意义。本文利用钻井和地震资料,提出塔北隆起二叠纪岩浆岩岩性主要为玄武岩、流纹岩、辉绿岩、正长岩、花岗岩和凝灰岩。岩浆岩发育模式与构造作用密切相关,在英买力低凸起北部地区,主要发育一条逆冲断层,地层受构造作用扰动较少,岩浆岩主要为玄武岩,通过近于垂直的通道到达地表; 英买2地区,构造挤压作用在盐上形成大量的构造裂缝,岩浆岩侵入其中,形成辉绿岩侵入体; 哈拉哈塘地区构造变形微弱,岩浆岩通过垂直的火山通道到达地表,在地表形成了一层平行分布的喷发岩; 而在塔北隆起的中部,由于受拉张作用的影响,地壳发育一定的减压熔融,形成中酸性岩浆,岩浆侵位产生了大量的中酸性侵入体和喷出岩。

Seismic interpretation of occurrence of Permian magmatite and its emplacement in Tabei uplift, Tarim basin

A large area of magmatite emplaced in the Tabei Uplift. The research of the occurrence model of the magmatite is very important for the oil and gas exploration. Well and seismic data were used to research the emplace model. Basalt, rhyolite, dolerite, sienite, granite and stuff were developed in the Tabei Uplift. The structural deformation had a great impact on the igneous occurrence. In north, a thrust fault was developed and the basalt erupted through the vertical channel. In the Yingmai 2, a lot of fractures were formed by the structural stress, and then magma emplaced and formed dolerite. In Halahatang, there was very little structural deformation and magma erupted through the vertical channel. In middle part, because of tension stress, crust was decompressed and melted, and persiliceous rock was developed.