天然气储层综合预测技术在锦州27区的应用

COMPREHENSIVE PREDICTION TECHNIQUE FOR NATURAL GAS RESERVOIR APPLIED IN THE BLOCK JINZHOU 27

锦州27区属于复杂断块区,地质建模比较困难,常规的储层预测方法效果不好。选用井约束稀疏脉冲反演技术与地震属性相结合的方法,对锦州27区储层进行了综合预测。介绍了约束稀疏脉冲反演技术的基本原理及其实现方法;用约束稀疏脉冲方法进行了波阻抗反演,得到了相对波阻抗剖面和绝对波阻抗剖面;并把波阻抗剖面转换成了砂泥岩剖面,其反演结果与井的钻探结果基本吻合;沿目的层(T3u1)顶面向下提取了波阻抗数据体和地震数据体的多种属性。根据多属性综合分析,圈定几个砂体发育带作为油气有利聚集区,并最终落实了钻井目标。储层综合预测技术在勘探程度比较低的地方可以较准确地预测储层岩性和展布规律,对油气田的进一步勘探开发以及降低勘探开发风险有一定的指导意义。

It is difficult to build geologic model while conventional reservoir prediction method cannot get a good effect since reservoirs in the block Jinzhou 27 are in complex fault-block area. As a result, the constrained sparse pulse inversion technology in combination with seismic attribution is used to predict reservoirs in the block Jinzhou 27 comprehensively. The basic theory and implementation method of constrained sparse pulse inversion are introduced in this article. It is used to carry out wave impedance inversion to obtain relative wave impedance profiles and absolute wave impedance profiles, then they are converted into sand-mudstone profiles. The inversion result is consistent with the drilling result. The attributions of wave impedance data volumes and seismic data volumes are extracted along the top of target layer(T3u1). According to the analysis, several sandbody developing areas are pointed as beneficial gas-oil gathering area to ascertain drilling target in the end. The results show that the use of comprehensive reservoir prediction technology in area with low exploration extent can predict reservoir lithology and distribution law with relative high accuracy, which can be guidance to the further oil and gas field exploration and lessen exploration risk.