塔中西部平台区油气分布差异性及其主控因素

塔中北斜坡奥陶系碳酸盐岩蕴含着丰富的油气资源，但油气藏类型复杂多样，按照PVT 和流体组分可以划分
为油藏、挥发性油藏和凝析气藏3 种类型，三者在空间上分布复杂。通过对塔中北斜坡西部平台区大量单井及其生产
状况的解剖，结合分析化验和地震资料，深入探讨了本区流体分布和性质特征、断裂和储层差异，揭示了造成油气分布
差异性的主控因素。认为奥陶系良里塔格组良三段顶部的不整合面在垂向上控制了储层层位和储层规模，储层在横
向上的强非均质性是油气平面分布差异的重要原因；走滑断裂作为油气运移通道对储层改造明显，直接决定了不同区
域的古油藏在晚喜马拉雅期遭受的气侵强度，是目前本区油气藏相态多样性和性质差异的直接原因。

Differential Hydrocarbon Distribution and Its Main ControllingFactors of Plat Area in Western Tazhong

There is abundant hydrocarbon in the carbonatite of Tazhong northern slope of Tarim Basin，and there are complicated
and multiple reservoir types in this area，which can be divided into three types by PVT and fluid component：oil reservoir，
volatile oil reservoir and condensate reservoir. By analyzing production performances of mass wells，seismic data as well as
testing data and discussing the distribution of fluids，faults and reservoir，oil/gas distribution difference and its main dominating
factors were revealed. The weathered crust unconformity developed in the top of O1l3 controlled the reservoir depth and reservoir
thickness vertically；the reservoir horizontal inhomogeneity is the important reason for the differential oil/gas distribution.
The strike-slip faults as migration pathway have obvious reformation to reservoir，which decides the gas cutting intensity of
different fossil reservoirs in late Himalayan and the different phase reservoirs distribution，and this is the immediate cause for
the multiple reservoir types and the complicated fluid characteristics in this area.