库车坳陷东秋里塔格构造带隐伏构造定量化计算  

Quantitative calculation on buried structure of Eastern Qiulitage structural belt,Kuqa dpression

作　　者：徐振平[1] 赵博[2,3] 汪新[2,3] 罗浩渝[1] 王腾宇[1] 吴少军[1] 

机构地区：[1]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒841000 [2]浙江大学地球科学学院,浙江杭州310027 [3]教育部含油气盆地构造研究中心,浙江杭州310027

出　　处：《石油学报》2016年第3期311-317,共7页Acta Petrolei Sinica

基　　金：国家重大科技专项(2011ZX05003-004)资助

摘　　要：库车坳陷膏盐层下伏是油气富集区,由于盐层遮蔽作用,盐下地震反射信息模糊,构造解释存在争议。依据临界楔理论测量克拉苏、迪那构造带盐下逆冲构造楔顶面坡度角α和底部滑脱层倾角β,线性拟合盐下构造楔回归直线,求解岩性强度和底部滑脱断层摩擦强度。东秋里塔格构造带与克拉苏、迪那构造带相邻,构造特征和变形机制一致,岩性强度和底部滑脱层强度参数相近。东秋里塔格构造带盐下逆冲构造楔顶面坡度角α为6°,底部滑脱面倾角β为7°,推断东秋里塔格背斜盐下发育低缓逆冲断层,逆冲断层沿中生界底部滑移。依据沉积楔构造缩短量计算方法,迪那构造带中生界缩短6.5 km,迪那背斜吸收全部缩短量,东秋里塔格构造带中生界缩短9 km,东秋里塔格背斜吸收6 km,剩余3 km需要断层吸收,预测东秋里塔格背斜下伏发育小规模逆冲断层。The hydrocarbon enrichment zone is underlying the gypsum-salt bed of Kuqa depression. Due to the sheltering effect of salt bed,the under-salt seismic reflection information is fuzzy,and a controversy exists on structural interpretation. According to critical wedge theory,the slope angle α of top surface and dip angle β of basal detachment layer in Kelasu and Dina structural belt uner-salt thrust structure wedges were measured,and the linear fitting to the regression straight line of under-salt structure wedge was carried out to solve the rock strength and frictional strength of basal detachment fault. The Eastern Qiulitage structural belt is neighbored with Kelasu and Dina structural belt,presenting consistent structural characteristics and deformation mechanism as well as nearly the same rock strength and strength parameter of bottom detachment layer. The slope angle of top surface in the Eastern Qiulitage structural belt under-salt thrust structure wedge is α = 6°,and the dip angle of basal detachment layer is β = 7°. It is deduced that low gentle thrust fault was developed in Eastern Qiulitage structural belt under-salt layers,and thrust fault slipped along the bottom of Mesozoic formation. According to the calculation method for the shortening amount of sedimentary wedge structure,Dina structural belt Mesozoic strata were shortened by 6. 5 km and completely absorbed by the Dina anticline. The Mesozoic Eastern Qiulitage structural belt was shortened by 9 km,of which 6 km was absorbed by the Eastern Qiulitage anticline,and 3 km was absorbed by faults. It is predicted that there are small thrust faults underlying the Eastern Qiulitage anticline.

关 键 词：临界楔理论 东秋里塔格 断层转折褶皱 定量模型 膏盐岩 

分 类 号：TE121[石油与天然气工程—油气勘探]