摘要
基于岩心、铸体薄片、常规测井、高压压汞等资料,利用汞饱和度法计算分形维数,研究合水地区长8段储层碳酸盐胶结物成因、特征及其对储层微观特征的影响。结果表明:合水地区长8段储层碳酸盐胶结物的来源主要受泥岩厚度、碎屑长石类型的综合影响。泥岩厚度大的部位邻近储层碳酸盐胶结强,钙长石和钾长石的溶解分别为储层直接和间接提供充足的钙离子。储层孔隙度和渗透率随碳酸盐胶结物体积分数增加呈明显降低趋势,不同体积分数碳酸盐胶结物对储层孔喉结构的影响分为双阶梯形态明显、不明显和不具双阶梯形态3类。碳酸盐胶结物与分形维数具有较好的正相关关系,随碳酸盐胶结物体积分数的增加,储层非均质性逐渐增强。该结果为合水地区长8段储层石油勘探开发提供参考。
Based on the data of core,casting thin section,conventional logging,high-pressure mercury intrusion,mercury saturation method is used to calculate the fractal dimension,and the genesis and characteristics of carbonate cements in the Chang 8 Reservoir section of the Heshui Area are studied.The results show that the source of carbonate cement in the Chang 8 Reservoir section of the Heshui Area is mainly affected by the thickness of mudstone and the type of clastic feldspar.The thick mudstone is adjacent to the reservoir with strong carbonate cementation,and the dissolution of anorthite and potash feldspar provide sufficient calcium ions for the reservoir directly and indirectly,respectively.Reservoir porosity and permeability show a significant decreasing trend with the increase of carbonate cement volume fraction.The effect of carbonate cements with different volume fractions on the pore throat structure of the reservoir can be divided into three categories:obvious double-step morphology,insignificant double-step morphology and no double-step morphology.The salt cement has a good positive correlation with the fractal dimension.As the volume fraction of carbonate cement increases,the heterogeneity of the reservoir gradually increases.This result provides a reference for the oil exploration and development of the Chang 8 Reservoir section in the Heshui Area.
作者
南凡驰
吴少波
陈朝兵
赖雅庭
陈新晶
王茜
阮昱
何拓平
NAN Fanchi;WU Shaobo;CHEN Zhaobing;LAI Yating;CHEN Xinjing;WANG Xi;RUAN Yu;HE Taping(School of Geosciences and Engineering,Xi'an Petroleum University,Xi'an,Shaanxi 710065,China;Shaanxi Key Laboratory of Oil and Gas Accumulation Geology,Xi'an,Shaanxi 710065,China;Gas ProductionPlant No.2,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710200,China;Oil Production Plant No.6,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710200,China)
出处
《东北石油大学学报》
CAS
北大核心
2021年第2期41-52,I0003,I0004,共14页
Journal of Northeast Petroleum University
基金
国家自然科学基金项目(41802140)
国家科技重大专项(2016ZX05050-006)
陕西省自然科学基础研究计划项目(2019JQ-257)
西安石油大学研究生创新实践能力培养项目(YCS19113043)。
关键词
碳酸盐胶结
成因特征
微观特征
分形维数
长8段储层
合水地区
carbonate cement
genetic characteristics
micro-features
fractal dimension
Chang 8 Reservoir section
Heshui Area
