现代地质2017，Vol.31Issue(4)：779-790,12.
柴达木盆地英西地区E32盐类矿物成因及油气地质意义
Origin of Salt Minerals and Oil-gas Geological Significance of E32 Reservoirs in Saline Lacustrine Basin of the Yingxi Area, Qaidam Basin
摘要
Abstract
In recent years,an important discovery in exploration has been made in E32 of Oligocene in Yingxi area of Western Qaidam Basin.Based on core observation,systemic microscopic characteristics analysis,mineralogy analysis and geochemical analysis,the salt minerals characteristics,origin and role in the process of hydrocarbon accumulation in Oligocene in saline lacustrine basin are systematically studied in the Yingxi area of Qaidam Basino (1) In this area,there are 4 important salt minerals,halite,gypsum,glauberite and celestite,which are gathered to form saline layers with certain thickness,or developed in matrix carbonate rock in the form of mineral particles.In upper reservoir group in middle of saline layers,the saline layers are thicker,and mainly rock salt,where thin oil layers are developed.In lower reservoir groups,the saline layers are thinner,and mainly gypsum.(2) Salt minerals has geochemical characteristics of ‘ low content of Mn',the matrix carbonate rock associated with salt minerals has ‘ low temperature'C-O isotope geochemical characteristics,petrological characteristics without the hydrothermal minerals and distribution characteristics of a very wide range.All of the above characteristics show the salt minerals in this area are typical deposition type in saline lacustrine basin,not hydrothermal brine precipitation type.(3) ‘ salt'plays an important role in the process of hydrocarbon accumulation.Salt minerals play roles of filling crack and roles in sealing of preventing dissipation of oil and gas.Salt layers play a role in sealing and covering due to high capillary breakthrough pressure and plastic characteristics.Salt minerals promote the secondary pore development in dolomite and negative effect is occupying certain reservoir space.So the results of this research can provide an important guidance for oil and gas exploration in subsalt laver of saline lacustrine carbonate rocks.关键词
柴达木盆地/英西地区/咸化湖盆/E32/盐类矿物/封盖作用Key words
Qaidam Basin/Yingxi area/saline lacustrine basin/E32/salt mineral/role of sealing and covering分类
天文与地球科学引用本文复制引用
黄成刚,李智勇,倪祥龙,马新民,张世铭,高妍芳,杨森,崔俊,伍坤宇..柴达木盆地英西地区E32盐类矿物成因及油气地质意义[J].现代地质,2017,31(4):779-790,12.基金项目
国家科技重大专项“前陆冲断带及复杂构造区油气成藏规律、关键技术及目标评价”(2016ZX05003-006) （2016ZX05003-006）
中国石油重大科技专项“柴达木盆地建设千万吨油气田综合配套技术研究”(2011E-03). （2011E-03）
