塔中地区火成岩特征及其石油地质意义

The characteristics of igneous rocks and their influences to petroleum exploration in the center of Tarim Basin

1. 中原油田分公司勘探开发科学研究院,河南濮阳457001;2. 中原油田勘探局地质调查处,河南濮阳457001

1. Exploration and Development Institut of SINOPEC Zhongyuan Oilfield Company, Puyang 457001, China;2. Geologic Division of Zhongyuan Oilfield Exploration Bureau, Puyang 457001, China

塔里木盆地塔中地区古生代曾发生过多期大规模火山活动, 但从地震剖面上多数难以看出火山活动的痕迹。火山活动与塔中地区沉积埋藏史和热史密切相关, 对生、储、盖、圈、运、保等成藏条件有较大的影响, 特别是早二叠世晚期火山活动对志留系和石炭系古油藏影响尤甚。通过对塔中地区中西部火成岩的产状、分布规律、岩电性特征及形成期次的研究, 揭示了火成岩对油气的影响, 指明了进行火成岩研究对该区油气勘探的重要意义。

There are several large scale volcanic activities once occurred in the center of Tarim Basin in the Paleozoic era. It is hard to distinguish the hints of the volcanic activities from seismic sections. These activities not only influenced the sedimentary and geothermal history, but also have much influence to the conditions and situations of hydrocarbon accumulation, especially the volcanic activity at late of the early Permian epoch has much influence to the Silurian and the Carboniferous reservoirs. Through the investigation of attitude, distribution, electrical property, and forming time of the igneous rocks in center of Tarim Basin, this paper discussed the influence of igneous rocks to oil and gas, and the significance of analysis of igneous rocks to oil and gas exploration in this area.