塔里木盆地塔中-巴楚地区侵入体温度场演化特征及其与油气储层的关系

doi:10.11743/ogg20090109

Abstract

Abstract:

Through microscopic identification,geochemical analysis and numerical simulation of the intrusions penetrated in the Tazhong-Bachu area,the paper discusses their thermal effect and influences upon the development of carbonate reservoirs.The study indicates that the layered intrusions in the carbonate reservoirs in the area are mainly of hypersthene gabbro and dolerite.The former has labradorite and hyperite as the host minerals and apatite as the accessory mineral,while the later has a host mineral assemblage consisting mainly of clinopyroxene and basic plagioclase.Geochemical analysis shows that the gabbro from Well He-3 and He-4 belongs to alkaline series,with w(SiO₂)of 44.58%-45.39%,w(K₂O+Na₂O) of 3.91%-4.67%,and w(Na₂O)/w(K₂O) of 2.16%-4.23%.Its partitioning pattern of REE is of LREE enrichment type,with LaN/YbN ranging from 5.010 to 5.980,and δEu from 0.910 to 1.002,with very weak or even no negative Eu anomaly.The equation of heat conduction was used to calculate temperature profiles adjacent to the thin layered intrusions during the cooling processes.The result points out that these intrusions have limited range of thermal effect,which is closely related to the thickness of intrusions:the thicker,the bigger.

Key words: hypersthene gabbro, dolerite, heat conductive modeling, reservoir, Tazhong-Bachu area, Tarim Basin

CLC Number:

TE122.2

Nie Baofeng, Yu Bingsong, Liu Yongshun, Xu Zheping, Yang Xiaofa, Yang Yongheng. Relation between the evolution of temperature field of intrusions and the development of carbonate reservoirs in Tazhong-Bachu area,the Tarim Basin[J]. Oil & Gas Geology, 2009, 30(1): 59-67,73.

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Relation between the evolution of temperature field of intrusions and the development of carbonate reservoirs in Tazhong-Bachu area,the Tarim Basin

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