相控叠前地质统计学反演在储层预测中的应用——以四川盆地川西坳陷须家河组二段致密砂岩储层为例

doi:10.13809/j.cnki.cn32-1825/te.2024.04.008

摘要/Abstract

摘要：

四川盆地川西坳陷新场构造带高庙子气田须家河组二段致密砂岩气藏多套砂体叠置，相变明显，表现为“整体富砂、局部含气”的特征，但有效储层发育段与泥岩的阻抗相当，常规叠后反演方法难以准确预测砂体边界及优质储层分布。在须二段地质特征研究基础上，首先开展有利相带边界识别及预测研究，并结合岩石物理敏感参数分析，开展相控约束下叠前地质统计学反演研究，实现对有效储层与泥岩层劈分，进而完成了相控有效储层预测。预测结果不仅提高了砂体识别精度，同时也提高了有效储层预测的可靠性，预测结果与实际钻井吻合度较高。该预测技术有效支撑了合兴场气田储量提交和探井井位部署，已产生了一定的油气效益。

关键词: 致密砂岩, 地震相, 敏感参数, 叠前地质统计学反演, 有效储层预测

Abstract:

The second member of Xujiahe Formation in Gaomiaozi Gas Field, located in Xinchang fault zone of western Sichuan Depression, Sichuan Basin, is a typical tight sandstone gas reservoir with multiple layers of superimposed sand bodies. The sand bodies exhibit clear transverse phase transitions, characterized as “overall sand rich, locally gas rich”. However, due to the impedance of the high-quality reservoir being similar to that of mudstone, traditional post-stack inversion methods struggle to accurately delineate the boundaries of the sand body and the distribution of high-quality reservoir zones.To address these challenges, the study initially focused on identifying and predicting the boundary of the favorable facies zones based on the geological characteristics of the second member of Xujiahe Formation. This was complemented by an analysis of sensitive petrophysical parameters. Subsequently, a pre-stack geostatistical inversion study was conducted under phase control constraints. This approach enabled the differentiation between effective reservoirs and mudstone, culminating in an accurate prediction of phase-controlled effective reservoirs. The results of this predictive technology not only enhanced the accuracy of identifying sand bodies but also improved the reliability of predicting effective reservoirs. The outcomes closely matched the actual drilling results. This prediction technology has significantly supported the reserve submission and the strategic deployment of exploration well locations in the Hexingchang gas field, yielding substantial oil and gas benefits.

Key words: tight sandstone, seismic facies, sensitive parameter, prestack geostatistical inversion, effective reservoir prediction

中图分类号:

TE122

赖未蓉,杨国鹏,宋沛东等. 相控叠前地质统计学反演在储层预测中的应用——以四川盆地川西坳陷须家河组二段致密砂岩储层为例[J]. 油气藏评价与开发, 2024, 14(4): 586-592.

Weirong LAI,Guopeng YANG,Peidong SONG, et al. Application of facies-controlled prestack geostatistical inversion in reservoir prediction: A case study of tight sandstone reservoir in the second member of Xujiahe Formation in western Sichuan Depression, Sichuan Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(4): 586-592.

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