Seismic prediction technology for “sweet spot” reservoirs of glutenite reservoirs and application effects: A case study of glutenite from second member of Baikouquan formation of Huangyangquan fan body in western slope area of circum-Mahu sag
CHEN Yongbo1, YANG Chao1, MA Sijun2, RU Qi2, CHEN Xuezhen1, WANG Xiaohui3
1. Research Institute of Petroleum Exploration and Development Northwest, PetroChina, Lanzhou, Gansu 730020, China; 2. Laojunmiao Oil Production Plant of PetroChina Yumen Oilfield Branch, Jiuquan, Gansu 735200, China; 3. BGP Inc., CNPC, Zhuozhou, Hebei 072750, China
Abstract：In the western slope area of circum-Mahu sag, Junggar Basin, the second member of Triassic Baikouquan formation develops glutenite reservoirs, and the main controlling factors of accumulation include favorable facies belt of glutenite in the delta front, thickness of high-quality reservoirs, porosity, and oil source fault.The reservoir layer thickness is small; the lateral change is fast; the buried depth is large, and the wave impedance difference between the reservoir and the surrounding rock is small, so the "sweet spot" reservoir plane distribution cannot be accurately predicted by using a single geophysical method.Affected by factors such as low signal-to-noise ratio and poor amplitude retention of seismic data, the prediction accuracy is not high, and the success rate of drilling is low.In order to predict the plane distribution range of the "sweet spot" reservoir of glutenite, this paper adopts the integrated research idea of logging, geology, and seismic data controlled by the "five-step method" step by step.The OVT domain technique of "split-seismic facies data stacking" is used to process T1b target, which lays a data foundation for reservoir prediction.In the 3D seismic data of the OVT domain, the paleo-geomorphology is finely restored by utilizing global 3D automatic seismic stratigraphic interpretation.Combined with single well facies and seismic properties, the fan delta subfacies boundary is accurately characterized.The thickness, range, and porosity of high-quality reservoirs are predicted by pre-stack inversion, and the fracture attribute data body is constructed by using the eigenvalues of the structure tensor matrix, so as to predict the fracture profile and plane distribution characteristics of the oil source.The "sweet spot" reservoir develops in the front subfacies of the fan delta, where the reservoir thickness and porosity are high, and where the oil source fracture exists.According to the research results, the success rate of the pre-exploration wells deployed is more than 92%, which is worthy of popularization and application under similar geological background conditions.
陈永波, 杨超, 马斯骏, 茹琦, 陈雪珍, 王晓辉. 砂砾岩岩性油气藏“甜点”储层地震预测技术及应用效果——以环玛湖凹陷西斜坡区黄羊泉扇体百口泉组二段砂砾岩为例[J]. 石油地球物理勘探, 2023, 58(5): 1182-1191.
CHEN Yongbo, YANG Chao, MA Sijun, RU Qi, CHEN Xuezhen, WANG Xiaohui. Seismic prediction technology for “sweet spot” reservoirs of glutenite reservoirs and application effects: A case study of glutenite from second member of Baikouquan formation of Huangyangquan fan body in western slope area of circum-Mahu sag. Oil Geophysical Prospecting, 2023, 58(5): 1182-1191.
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