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 Tazhong Ⅰ gas 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 Member 5. (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.