我国典型陆相特低渗油藏的系统表征方法综述

Systematic Characterization of Terrestrial Facies Reservoir with Tight Formation in Western Region of China

准确评价开发潜力、确定合理的开采技术政策是特低渗油藏精细表征的根本目标。以准噶尔盆地和鄂尔多斯盆地典型陆相特低渗油藏为对象,通过地质、测井、储层建模、油藏工程多学科研究,形成了砂体结构-储层属性-开发潜力一体化系统表征技术方法。依靠高分辨率层序结构识别及精细层序划分,以及多井对比、地质综合解释与开发动态校验等技术揭示了断裂切割薄砂层的空间分布特征与规律;利用相标志、灰色关联和测井曲线元等方法识别的储集相类型及特征,以及基于岩心刻度综合测井模型解释获得的储层及油层参数,建立了基于三阶段互控技术的储层定量地质模型,刻划了储集砂体的属性特征及分布规律;通过对比,选择两级模糊综合方法评价了开发潜力;在此基础上确定了高效开采合理技术政策指标,为实现陆相特低渗油藏原油稳产高产开采提供了技术支撑。

The ultimate goal about fine characterization of reservoir with tight formation is to accurately evaluate development potential and reasonably establish recovery technology.For this reason,this paper proposed the methodology for systematic characterization of reservoir architecture,characteristics and development potential capacity,taking the tight reservoirs in Junggar and Ordos basins as the research subject.This methodology is established by multidisciplinary research such as geology,logging,model building,reservoir engineering etc.By the reservoir architecture analyzing methods including high resolution sequence stratigraphy,multi-well fine strata correlation,geologic synthesis interpretation and development performance check analysis,the distribution law of slight sandbody bed cut by faults was revealed.The reservoir characteristics was delineated by the methods including reservoir facies analysis on the basis of facies index,log grey correlation and log curve unit,petroleum reservoir parameter and model with core analysis,and 3D reservoir modeling on three-stage controlled technique.The development potential capacity was evaluated by selecting two-stage fuzzy synergistic evaluation.In end,the high efficiency and reasonably recovery policy was establish,and the steady and high efficiency development pattern was built up by the methodology described in this paper.