库车坳陷大北-克拉苏深层构造带有效储层埋深下限预测

白垩系巴什基奇克组是库车坳陷大北-克拉苏深层构造带一套优质储层和主要产层，其埋深大于5000m，岩心资料缺乏，有效储层分布预测难度大。应用模型预测法、测井孔隙度包络线法、有效储层占砂岩厚度百分比法和盆模正演法4种方法，对大北-克拉苏深层构造带有效储层的埋深下限进行了预测。由于方法本身和资料品质的差异性，在不同构造区带不同方法预测的相对可靠程度以及结果有差异。采用储层评价中常用的“权重”评价法，根据各种方法的可靠程度，给予不同的权重系数，对大北-克拉苏深层构造带综合评价表明，其有效储层埋深下限约为8000~8300 m，其中大北区带约为8200 m，克深区带约为8300 m，克深北区带和克深南区带约为8100 m，拜城北区带约为8000 m。有效储层占砂岩厚度百分比是深部储层评价的重要参数，大北-克拉苏深层构造带巴什基奇克组储层埋深与有效储层占砂岩厚度百分比呈三次幂关系，可以利用储集层的埋深范围，反过来求其有效储层厚度。

Prediction of the lower limit of burial depth for effective reservoirs in the Dabei- Kelasu deep structural belt of Kuqa Depression

The Cretaceous Bashijiqike Formation is one of the high-quality sandstone reservoirs and a primary oil/gas-producing bed in the Kuqa Depression of Tarim Basin.As its burial depth is more than 5000m and cores are limited,the prediction of effective reservoirs in the Dabei-Kelasu deep structural belt is considerably difficult.Four methods,including the model-based prediction,envelop curves of porosity from logging data,the ration of effective reservoirs to sandstones and the forward modeling for Basin Modelin...