塔中Ⅰ号气田TZ83井区环状断溶体储层发育特征及油气聚集规律  

Development characteristics and oil-gas accumulation rules of fault-karst reservoir of TZ83 well area in Tazhong Ⅰ gas field

作　　者：韩杰[1] 袁源[1] 肖春艳[1] 李相文 汪鹏[1] 赵红[1] HAN Jie;YUAN Yuan;XIAO Chunyan;LI Xiangwen;WANG Peng;ZHAO Hong(不详;Research Institute of Exploration&Development,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China)

机构地区：[1]中国石油塔里木油田公司勘探开发研究院 [2]中国石油东方地球物理公司研究院库尔勒分院

出　　处：《海相油气地质》2020年第3期234-242,共9页Marine Origin Petroleum Geology

基　　金：中国石油天然气股份有限公司重大专项“塔里木油田勘探开发关键技术研究及应用”(编号:22121G20112001)资助

摘　　要：TZ83井区鹰山组缝洞型碳酸盐岩凝析气藏是塔里木盆地塔中I号气田奥陶系大型碳酸盐岩凝析气藏的重要组成部分。通过井-震标定、地震资料精细解释,利用曲率、相干和波阻抗等地震属性识别研究TZ83井区环状断溶体储层。研究表明:①环状断溶体储层主要发育于鹰山组一段-良里塔格组五段,为环状洞穴层;②加里东中期广泛发育的不整合岩溶形成了环状断溶体的雏形,加里东晚期-海西期形成的X剪切断裂控制了环状断溶体储层发育的规模;③油气分布主要受环状断溶体储层发育规模的控制,可划分为3个相对独立的油气藏,这3个油气藏的硫化氢含量、气油比和开发特征均表现出极大的差异性。指出TZ83井区环状断溶体是在弱走滑条件下受X剪切断裂影响而形成,储层发育具有选择性、受控性、继承性和不均匀性的特点,这与塔里木盆地其他地区受大型区域性走滑断裂控制的断溶体,在储层形成机理及油气分布等方面存在较大差异。The fractured-vuggy carbonate condensate gas reservoir of the Yingshan Formation in TZ83 well area is an important part of the huge Ordovician carbonate condensate gas reservoirs in TazhongⅠgas field, Tarim Basin. On the basis of well-seismic calibration and fine interpretation of seismic data, seismic attributes such as curvature, coherence and wave impedance were used for identifying and studying the cyclic fault-karst reservoir in TZ83 well area, and the development characteristics and oil-gas accumulation rules of cyclic fault-karst reservoir have been concluded as following:(1)The cyclic fault-karst reservoir is a ring cave layer which is mainly developed in the Yingshan Member 1 to Lianglitage Member5.(2)The widely developed unconformity karst in the Middle Caledonian forms the rudiment of cyclic fault-karst, and the X-shear fault formed in the Late Caledonian to the Hercynian controls the scale of the cyclic fault-karst.(3)The distribution of oil and gas is mainly controlled by the scale of the cyclic fault-karst reservoirs, which can be divided into three relatively independent oil and gas reservoirs with great differences in hydrogen sulfide content,gas-oil ratio and development characteristics. It is pointed out that the cyclic fault-karst reservoir in TZ83 well area is formed under the influence of X-shear fracture in the condition of weak strike-slip, and the cyclic fault-karst reservoir has such characteristics as "selectivity, controllability, inheritance and heterogeneity", which is quite different from the fault-karst controlled by large regional strike-slip fault in other areas of Tarim Basin in reservoir forming mechanism and oil-gas distribution.

关 键 词：断溶体 储层 碳酸盐岩 凝析气藏 奥陶系 塔里木盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]