利用露头信息预测吐孜洛克气田储集砂体

Using outcrop information of Kuqa depression to predict reservoir sand bodies in Tuziluoke gas field

库车坳陷吐孜洛克气田因钻井资料稀少 ,应用大量丰富的地表露头信息 ,开展上第三系吉迪克组砂泥岩段储集砂体预测更具有现实意义。通过在野外开展沉积微相分析及建立砂层组、储集层段规模两种不同尺度的原型模型 ,并运用储集层建筑结构层次分析法对砂体的类型、组合、规模及隔、夹层特征进行精细描述的基础上 ,运用原型模型提供的砂体几何形态、结构特征等参数 ,结合钻井、测井资料 ,采用条件模拟方法开展了吐孜洛克气田吉迪克组砂泥岩段井间储集砂体预测。研究表明 ,砂体以滨湖砂坝沉积为主 ,多呈板状 ,少量呈楔状或透镜状 ;砂岩集中段砂体厚度较薄 ,见复合式向上“变粗”型、单向式向上“变粗”型、韵律型等三种类型的复合砂体 ;砂体垂向上连通性较差 ,侧向连续性好 ,纵向上以第一、第二亚段为最有利的勘探目的层段。

It is more practically significant to predict reservoir sand bodies of sand shale member of Jidik Formation, Neogene using the abundant surface outcrop information because of the rare drilling data in Tuziluoke gas field, Kuqa depression. Based on the original different scale models of sand unit and reservoir member developed for the field and the fine description of the type, combination, scale and restraining barrier of sand bodies by the sedimentary microfacies analysis and the analytical hierarchy process of reservoir frame, the random prediction of inter well reservoir sand bodies of sand shale member, Jidike Formation has been developed using the conditional modeling and the parameters of geometry and structural feature of sand bodies provided by the original models combining with drilling and logging data. The study shows that the sand bodies are mainly longshore bar, with more tabular sand and less lenticular sand or wedge shaped body. The thickness of sand bodies is small in the concentrated sand member. There are three types of complex sand bodies (types of complex coarse upward, single coarse upward and rhythmic type). The vertical connectivity of sand bodies is poor and the lateral connectivity is good. Vertically, the most favorable exploration targets are No.1 and No.2 sub members.