摘要
为了深入探讨深部岩浆活动对碳酸盐岩储层的影响,对塔里木盆地巴楚一间房地区的二叠系侵入岩及奥陶系碳酸盐岩围岩进行了详细的岩相学和地球化学研究.结果表明,研究区侵入岩主要为辉长岩和辉绿岩,为深成侵入岩,w（SiO2）为39.91％～44.62％,w（K2O＋Na2O）为3.04％～3.95％,w（Na2O）/w（K20）为2.32～2.8,属钠质碱性系列,形成于板内构造环境；微量元素分配模式以Ba富集Sr亏损为特征；稀土总量为106.72× 10-6～158.15× 10-6,LREE/HREE为5.44～5.89,LaN/YbN值为5.124 ～ 5.442,δEu为1.091～1.237,稀土配分模式属轻稀土富集型.野外观测与室内分析结果表明：粘土矿物的生成,使得紧邻侵入岩的碳酸盐岩储集物性较差；在侵入岩附近一定距离,由于流体的溶蚀能力增强,碳酸盐岩储集物性较好.
The magmatism can affect reservoir characteristics, and it can guide the oil and gas exploration. Through the microscopic identification and geochemical analysis, we studied the intrusive rocks in the Bachu-Yijianfang area. The composition of gabbro and diabase in the Bachu-Yijianfang area shows thatw(SiO2) 39.91%-44.62%,w(K2 O+Na2 O) 3.04%-3.95%, andw(Na2 O)/w(K2 O) 2.32-2.8; the rock is rich in Ba with a negative Sr anomaly;∑REE(106.72-158.15)×10-6, LREE/HREE 5.44-5.89, LaN/YbN 5.124-5.442, and δEu 1.091-1.237. The chemical characteristics and tectonic diagram show that the rock occurs in a typical within-plate environment, and belongs to the Na-rich alkaline series. Field observation and laboratory analysis results show that the formation of clay minerals makes the reservoir properties of carbonate adjacent to the intrusive rocks not good; then, for the carbonate reservoir with acertain distance from the intrusion, it is better in property due to the enhanced fluids dissolution.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第5期48-51,114,共4页
Petroleum Geology and Recovery Efficiency
基金
国家重点基础研究发展计划"973"项目"中国西部叠合盆地深部油气复合成藏机制与富集规律"(2011CB201100-03)
国家重点基础研究发展计划"973"项目"塔里木盆地古隆起迁移对碳酸盐岩储层发育的控制"(2006CB202302)
国家科技重大专项"大型油气田及煤层气开发"(2011ZX05009-002)
国家科技重大专项"塔里木盆地海相碳酸盐岩层系构造岩相古地理研究"(2011ZX05005-004-HZ06)
关键词
侵入岩
碳酸盐岩
围岩
储层
巴楚一间房地区
塔里木盆地
intrusive rocks
carbonate reservoir
surrounding rock
reservoir
Tarim basin
Bachu area
