川西南井研地区中二叠统栖霞组白云岩储层预测

Prediction of dolomite reservoir of the Middle Permian Qixia Formation in Jingyan area of Southwestern Sichuan

高博乐 李文杰

中国石化西南油气分公司勘探开发研究院，四川 成都 610094 成都理工大学油气藏地质及开发工程国家重点实验室，四川 成都 610059 成都理工大学能源学院，四川 成都 610059

近年来，随着川西南地区多口探井相继获得突破，证实了该地区中二叠统栖霞组具有极大的勘探潜力。该地区栖霞组白云岩储层埋深大、厚度薄、地震响应特征不明显，导致预测难度大。文中利用白云岩储层与围岩之间的弹性特征差异，对川西南井研地区钻井资料开展弹性参数分析——定量分析弹性参数的储层识别能力，构建储层指示因子，开展叠前弹性参数反演求取栖霞组储层指数属性体，对有利储层开展综合预测。研究结果显示，基于储层弹性参数分析获得的Fused属性地震数据体开展栖霞组白云岩薄储层预测，能够有效减少间接预测所导致的不稳定性和多解性，储层预测结果与实际钻井结果具有更高吻合度。研究成果对于推进研究区下一步勘探开发起到重要指导作用，也为薄层状碳酸盐岩储层的地震预测提供了一种新的思路。

In recent years, with the breakthrough of several exploration wells in Southwest Sichuan, it is confirmed that the Middle Permian Qixia Formation in this area has great exploration potential. However, due to the great burial depth, thin thickness and weak seismic response of dolomite reservoir of the Middle Permian Qixia Formation in this area, it is difficult to predict. In this paper, using the difference in elastic characteristics between the dolomite reservoir and its surrounding rock, the elastic parameters of the drilling data of Qixia Formation in the Jingyan Area of southwestern Sichuan Basin are analyzed to quantify the reservoir identification ability of the elastic parameters and construct reservoir indicator factors. The pre?鄄stack elastic parameter inversion is carried out to obtain the reservoir index attribute body of the Qixia Formation and to make a comprehensive prediction of favorable reservoirs. The results show that the prediction of thin dolomite reservoirs in the Qixia Formation based on the Fused attribute seismic data body obtained from reservoir elastic parameter analysis can effectively reduce the instability and multiplicity of solutions caused by indirect prediction, and the reservoir prediction results are in better agreement with the actual drilling results. The findings play an important role in guiding the next step of exploration and development in the study area, and also provide a new method for seismic prediction of thin?鄄layered carbonate reservoirs.

10.6056/dkyqt202305017