冀中拗陷北部潜山带隔层有效性综合评价  

Effectiveness of interlayers in buried hills, northern Jizhong depression

作　　者：王新龙 苏敏 刘宁静 许菲 Wang Xinlong;Su Min;Liu Ningjing;Xu Fei(Huabei Division,CNPC Logging Company Limited,Renqiu,Hebei 062552,China)

机构地区：[1]中国石油集团测井有限公司华北事业部

出　　处：《天然气勘探与开发》2018年第1期8-15,共8页Natural Gas Exploration and Development

基　　金：国家科技重大专项"隐蔽型深潜山及潜山内幕油气富集规律与勘探方向研究"(编号:2014E-3501-2-06)

摘　　要：冀中拗陷北部潜山带隔层能否起到有效隔层的作用,是深潜山及潜山内幕油气藏形成的关键。根据区域潜山成藏类型,层序地层、沉积相特点,结合岩心、薄片等实验数据及元素俘获、阵列声波、电成像等测井资料进行综合分析判断,对深潜山及潜山内幕奥陶系、寒武系、青白口系、蓟县系盖隔层分布特征进行总结分类,并从隔层的岩性、物性、烃浓度、压力封闭等微观特征进行评价,形成了一套较完整的隔层测井评价方法 :(1)利用自然伽马能谱、ECS元素测井资料,分析黏土矿物对封隔质量的影响,定量计算矿物组分含量,准确判断岩性;(2)利用交会图技术提高泥质岩物性计算精度;(3)综合利用三孔隙度曲线、电成像及阵列声波资料,提高浓度封闭及有效性评价计算精度;(4)对封隔性重要参数排替压力求取方法进行研究,提高了纵向封闭能力的判断精度。利用该方法对北部潜山带不同隔层类型的有效性进行综合评价,确定了隔层发育区分布规律,并建立了不同层位、不同区域的评价标准。The effectiveness of interlayers in buried hills,northern Jizhong depression,is the key factor to form deep buried hill and inner buried hill reservoirs.In this paper,the distribution characteristics of Ordovician,Cambrian,Qingbaikou and Jixian interlayers of deep and inner buried hills were identified and classified after comprehensive analysis on some experimental data(cores and thin sections)and logging data(element capture,array acoustic and electric imaging),depending on the types of buried-hill hydrocarbon accumulation,together with the characteristics of sequence stratigraphy and sedimentary facies.Then,the microscopic characteristics of interlayers were evaluated from aspects of lithology,physical property,hydrocarbon concentration,and pressure sealing.Finally,a relatively complete logging evaluation method suitable for interlayers was developed.First,the effect of clay minerals on interlayer performance is analyzed,the content of mineral composition is calculated quantitatively,and the lithology is discriminated accurately by using natural gamma-ray spectroscopy and ECS logging data.Second,crossplot technology is adopted to increase the calculation accuracy of physical properties of argillaceous rocks.Third,tri-porosity curve is combined with electric imaging and array acoustic log to increase the calculation accuracy of concentration sealing and effectiveness evaluation.And fourth,the method used to calculate the important sealing parameters(i.e.displacement pressure)is investigated,so as to improve the accuracy to discriminate the vertical sealing capacity.By virtue of this method,the effectiveness of interlayers in buried hills is evaluated comprehensively.Thus,the distribution laws of interlayer development areas are determined,and the evaluation criteria for different horizons and areas are established.

关 键 词：潜山内幕 深潜山 隔层分布 物性 烃浓度 排替压力 有效性 测井评价 

分 类 号：P618.13[天文地球—矿床学] P631.81[天文地球—地质学]