和田河气田奥陶系碳酸盐岩储层关键期构造裂缝预测  

Prediction of key period fractures of Ordovician carbonate reservoir in Hetianhe gas field

作　　者：任启强 金强[1] 冯振东 冯建伟[1] 杜赫 张亚军[3] REN Qiqiang;JIN Qiang;FENG Zhendong;FENG Jianwei;DU He;ZHANG Yajun(School of Geosciences in China University of Petroleum (East China), Qingdao 266580, China;School of Safety and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;Northwest Branch of China Petroleum Exploration and Development Research Institute, Lanzhou 730020, China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]河南理工大学安全科学与工程学院,河南焦作454003 [3]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《中国石油大学学报（自然科学版）》2020年第6期1-13,共13页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(2016ZX05014-002-006,2016ZX05047-003-003,2017ZX05013-006-003)。

摘　　要：基于岩心资料、成像测井裂缝参数的统计,考虑后期构造应力作用对先存裂缝岩体破坏方式的影响,推导塔里木盆地和田河气田海西晚期和喜马拉雅期裂缝参数叠加算法。结合三维有限元数值模拟方法,针对和田河气田的两个关键造缝期(海西晚期和喜马拉雅期)进行古构造应力场数值模拟,以两期裂缝参数叠加方式为指导,预测和田河气田奥陶系生物灰岩段构造裂缝的分布规律,并结合开发资料进行验证。结果表明,构造裂缝表现出较强的期次性,包括海西早期的低角度剪切缝、海西晚期的中—高角度构造剪切裂缝以及喜马拉雅期的高角度构造剪切缝。后期应力作用在具有先存裂缝的岩石上,产生的情况包括三种岩石不发生破裂;岩石只沿先存裂缝发生扩展;岩石既沿先存裂缝发生扩展,又产生新的裂缝。相对于玛4井区,玛5井区的裂缝密度低、开度大,导致其产量较低。玛4井区和玛5井区在平面上裂缝通而不畅,油气不易横向运输,只能在独立构造带区间进行运移。Using the core data and imaging logging data,the two-phase fracture parameter superposition algorithms in Hetianhe gas field of Tarim Basin were deduced by considering influences of late tectonic stress on the failure mode of pre-existing fracture rock mass.Combined with a three-dimensional finite element numerical simulation method,the numerical simulation of the paleo-tectonic stress field was carried out in the two pivotal seam-forming periods,the late Hercynian and Himalayan period of Hetianhe gas field.The distribution of tectonic fractures in the bio-limestone formation in the Ordovician was predicted based on the two-stage fracture parameter superposition,and was subsequently verified by the development data.The results show that the formation of tectonic fractures shows strong periodicity,low angle shear fractures during the early Hercynian period,medium-high angle shear fractures during the late Hercynian period,and high angle shear fractures during the Himalayan period.Where rocks with pre-existing fracture are subjected to later tectonic stress,three rapturing types were distinguished no rupture,only expanding along the pre-existing fractures,and expanding along the pre-existing fractures and generating new fractures.Compared to well Ma 4 area,well Ma 5 area is characterized with low fracture density and high aperture,resulting in lower production.Fractures in the plane of Well Ma 5 and 4 area are not well connected,therefore the oil and gas are not easily transported horizontally,and can only be transported in the independent structural zones.

关 键 词：构造裂缝 裂缝发育特征 裂缝参数叠加 和田河气田 

分 类 号：P548[天文地球—构造地质学]