石油与天然气地质2025，Vol.46Issue(5)：1485-1503,19.DOI:10.11743/ogg20250507
三角洲与重力流砂体构型特征及其对油藏分布的控制
The configuration characteristics of delta and gravity flow sand bodies and their control on reservoir distribution—Chang 7 of Triassic Yanchang Formation in Ganquan area of Ordos Basin Oil layer group as an example
摘要
Abstract
The oil layer group of the 7th member of the Yanchang Formation(also referred to as the Chang 7 oil layer group)in the Ganquan area of the Ordos Basin hosts tight oil reservoirs of the delta-front and gravity-flow origin.This study aims to determine the differences in reservoir properties across varying sedimentary architectural units and the mechanisms through which these units control oil reservoir distribution and hydrocarbon enrichment.Using data from core observations,logging,and production performance,we analyze the architectural characteristics,vertical contact relationships,and distribution patterns of individual sand bodies within the deltaic and gravity-flow deposits in the Chang 7 oil layer group and explore the role of sand body architectures in controlling oil reservoir distribution.By combining data from well and production tests,we establish the hydrocarbon accumulation models associated with sand body architectures.The results indicate that the Chang 7 oil layer group contains four primary vertical sand body architecture types:continuously superimposed,intermittently superimposed,thinly interbedded,and single-layer types.Meanwhile,three lateral sand body architecture types are identified in the oil layer group:stable,swinging,and migrating.Vertically,the 1st subgroup of the Chang 7 oil layer group(also referred to as the Chang 71 oil layer subgroup)primarily exhibits the continuously superimposed sand body architecture,followed by the intermittently superimposed type.In contrast,the Chang 72 oil layer subgroup is dominated by the intermittently superimposed sand body architecture,succeeded by thinly interbedded type,while the Chang 73 oil layer subgroup predominantly contains the thinly interbedded and single-layer architectures.Literally,continuously and intermittently superimposed sand body architectures are widely seen in the northern and northeastern parts of the study area.In contrast,thinly interbedded architectures are mainly found in the south-central part of the study area,whereas the single-layer architecture is concentrated in the southern part.Continuously and intermittently superimposed sand bodies exhibit the most favorable reservoir properties,with the continuously superimposed sand bodies yielding the highest hydrocarbon production.Different types of sand body architectures exhibit varying superposition relationships with source rocks,with four types of source rock-reservoir configurations detected in the study area.The continuously superimposed sand bodies in the Chang 71 oil layer subgroup,among others,show the highest degree of hydrocarbon enrichment,followed by the intermittently superimposed sand bodies in the Chang 72 oil layer subgroup.The Chang 73 oil layer subgroup consists primarily of source rocks,while the continuously superimposed sand bodies in the Chang 71 oil layer subgroup are identified as the most promising target for future hydrocarbon exploration.关键词
源-储配置/成藏模式/油气分布规律/砂体构型/长7油层组/甘泉地区/鄂尔多斯盆地Key words
source-reservoir combination/accumulation mode/oil and gas distribution law/Sand body configuration/Chang 7 oil layer group/Ganquan area/Ordos Basin分类
能源科技引用本文复制引用
李晓龙,白玉彬,陈珊珊,张刚,王聪娥..三角洲与重力流砂体构型特征及其对油藏分布的控制[J].石油与天然气地质,2025,46(5):1485-1503,19.基金项目
国家自然科学基金项目(42372155) （42372155）
陕西省自然科学基础研究计划项目(2025JC-YBQN-437) （2025JC-YBQN-437）
陕西省教育厅专项科研计划项目(24JK0603). （24JK0603）
