东海低渗气藏储层改造区“甜点”预测技术研究与应用

Study and Application of “Sweet Spot” Prediction Technique in the Reservoir Reconstruction of Gas Reservoir with Low Permeability in East China Sea

秦德文 高红艳 钟韬 刘创新 夏瑜 单理军

QIN Dewen GAO Hongyan ZHONG Tao LIU Chuangxin XIA Yu SHAN Lijun

中海石油(中国) 有限公司上海分公司, 上海 200030

Shanghai Branch of CNOOC(China) Ltd., Shanghai 200030, China

西湖凹陷目的层埋藏深，低渗气藏占比大，需要通过储层改造方能有效开发，但储层非均质性强、横向变化快，优选甜点储层发育区是储层改造成功的关键。分析了三种不同类型“甜点”储层的地质成因，通过测井岩石物理分析优选了岩性、物性及含气性的敏感参数。运用叠前同步反演技术得到弹性敏感属性体，进而预测了砂岩厚度、物性、含气性及脆性指数的展布特征，将地质和工程优势属性融合得到一类和二类甜点发育区，为水平井多级压裂的井位方案设计提供重要参考依据。

The sandstone reservoirs in Xihu Sag are buried deeply and the gas reservoirs with low permeability account for a large percentage.In order to develop effectively,the reservoir reconstruction should be conducted.Due to the characteristics of strong heterogeneity and rapidly lateral change,how to identify the sweet spot area is a key to the success of reservoir reconstruction.Based on the analysis of the geological origin of sweet spot,the elastic parameters which are sensitive to lithology,physical properties and gas-bearing property were optimized by the analysis of petrophysical characteristics.And then the sensitive attributes determined by pre-stack synchronous inversion were used to predict the distribution characteristics of sandstone thickness,physical property,gasbearing and brittleness index.The first and second class of sweet spot areas can be identified by the combination of geological and engineering dominance attributes and can provide important reference to well location design of horizontal multi-staged fracturing.

https://doi.org/10.3969/j.issn.1008-2336.2017.02.045