西安石油大学学报（自然科学版）2024，Vol.39Issue(2)：1-11,78,12.DOI:10.3969/j.issn.1673-064X.2024.02.001
低程度风化火山岩风化壳结构划分与主控因素
Structure Division and Main Controlling Factors of Weathered Crust of Low-degree Weathered Volcanic Rocks:A Case Study of Carboniferous Volcanic Rocks in Chepaizi Uplift on Western Margin of Junggar Basin
摘要
Abstract
In order to solve the difficulties in dividing the structure of the weathered crust of low-degree weathered volcanic rocks and e-valuating and predicting volcanic rock oil and gas reservoirs,a systematic study was conducted on the petrology,mineralogy,geochemis-try,and reservoir properties of the weathered crust of the Carboniferous volcanic rocks in the Chepaizi Uplift using core,logging and seismic data from 28 wells in the study area.The results showed that the overall weathering degree of the rocks in the study area was rel-atively low.On this basis,a six-layer division scheme is proposed that divides the weathered crust into soil layer,hydrolysis zone,leached zone,disintegration zone,alteration zone,and parent rock zone from top to bottom.A decision tree model combined with SMOTE algorithm was used for the discriminent of the leached zone,disintegration zone,and alteration zone in basalt andesite in the study area by means of spontaneous-potential logging,natural gamma-ray logging,sonic logging,and resistivity well logging data,with an accuracy of 87.8%.Based on comprehensive analysis,it is held that there is heterogeneity in effective reservoir thickness,development degree of structural zones,and horizontal and vertical distribution of the low weathering volcanic rock weathered crust.The development of favora-ble reservoirs is mainly controlled by ancient landform and faulting.The favorable reservoirs developed mainly in leached zone and dis-integration zone,often distributed in slope areas of paleo-geomorphology,with a thickness generally within 350 meters.Affected by faul-ting,the effective reservoir thickness of weathered crust can reach 450 meters.关键词
低风化程度火山岩/火山岩风化壳结构/决策树判别模型/车排子凸起/准噶尔盆地西缘Key words
low weathering volcanic rock/weathered crust structure of volcanic rock/decision tree discriminant model/Chepaizi uplift/western margin of the Junggar Basin分类
能源科技引用本文复制引用
韩慧妹,孟凡超,王千军,陈林,张曰静,王林..低程度风化火山岩风化壳结构划分与主控因素[J].西安石油大学学报（自然科学版）,2024,39(2):1-11,78,12.基金项目
国家自然科学基金面上项目(42272225) （42272225）
山东省自然科学基金面上项目(ZR2021 MD083) （ZR2021 MD083）
中央高校基本科研业务费专项(23CX09004A) （23CX09004A）
崂山实验室科技创新项目(LSKJ202203401) （LSKJ202203401）
