巴楚—麦盖提斜坡区油、气、水成因分析及其勘探意义

发布时间：2018-07-15 15:12

【摘要】：针对巴楚—麦盖提斜坡区油气田的油、气、水特征存在较大差异性的现象,在对比油、气、地层水地球化学特征的基础之上,探讨分析了它们的成因。研究认为,和田河气田原油裂解气和干酪根裂解气的混合气在中—下寒武统膏岩封闭作用下发生硫酸盐热还原反应以后,以水溶气的方式运移至上覆奥陶系—石炭系圈闭中,形成了现今高干燥系数、重碳同位素特征的气藏,以及奥陶系风化壳顶面附近低矿化度、高变质系数的Na2SO4型地层水。中—下寒武统膏岩层对巴楚—麦盖提斜坡区油气形成、演化和分布有重要影响,膏岩层之下可以作为一个潜在的勘探领域。
[Abstract]:Based on the geochemical characteristics of oil, gas and formation water in the Bachu-Maigaiti slope area, the causes of the oil, gas and water characteristics are discussed and analyzed in the light of the large differences in the oil, gas and water characteristics of the oil and gas fields in the Bachu-Maigaiti slope area. It is considered that the mixture of crude oil cracking gas and kerogen cracking gas in Hetianhe gas field is transported in the Ordovician-Carboniferous trap in the way of water solution after sulfate thermal reduction reaction takes place under the sealing action of the middle and lower Cambrian gypsum rocks. Gas reservoirs with high drying coefficient, heavy carbon isotopic characteristics and low mineralization and high metamorphism coefficient of Na _ 2SO _ 4 formation water are formed near the top of the weathering crust of Ordovician. The Middle and Lower Cambrian gypsum strata play an important role in the formation, evolution and distribution of oil and gas in the Bachu-Maigaiti slope area, which can be regarded as a potential exploration field under the gypsum formation.
【作者单位】：中国石油勘探开发研究院西北分院;中国石油塔里木油田勘探开发研究院;
【基金】：中国石油天然气股份有限公司重大科技专项专题1子课题“塔西南坳陷麦盖提斜坡新区风险勘探领域研究与目标优选”(编号:041012120005)资助
【分类号】：P618.13

【参考文献】