镇北地区长3以上地层精细对比方法研究  

The Fine Strata Contrast Methods of Chang3 and Above Reservoirs in Zhenbei Area

作　　者：张庆洲 陈文龙 杨子清 杨军侠 樊建明 侯长兵 苟幸福 冯渊 

机构地区：[1]中国石油长庆油田分公司超低渗透油藏研究中心 [2]中国石油长庆油田分公司超低渗透油藏第四项目部

出　　处：《低渗透油气田》2013年第1期64-68,40,共6页

摘　　要：镇北地区长3以上地层厚度、构造变化大，由于前休罗系古地貌等诸多N素的影响，各标志层在研究区不同区域均有缺失．发育极不稳定．常规的标志层对比、厚度旋回法等难以直接适用，地震资料缺乏，地层对比困难，后续研究难以展开。为了建立针对此类复杂地层的精细地层对比研究方法和镇北地区长3以上地层划分标准，通过对研究区大量预探、评价、骨架井的岩心、铸体薄片进行观察研究，对相应井的测井曲线进行标定，寻找岩电对应关系，通过单井点地层特征分析一分区研究一综合各区对比研究逐步分析，提出了“三煤三灰（具有区域性指示意义的三套煤层和3套凝灰岩）”组合卡层新方法；再通过已开发区块的资料信息和前人的研究成果加以验证、修正，以至于逐步完善。最后确定了三叠系和侏罗系间的地层不整合面以及长3以上地层等时格架。对沉积相、油藏富集规律等进一步的研究提供了保障和依据．同时实现了水平井钻井成功率的突破。Background： the thickness and structure of the formations above Chang3 strata of Zhenbei area vary greatly. Due to the influence of various factors like the Pre-Jurassic paleo-landform, etc., each marker bed has hiatus and develops extremely unstably in different areas of the research area. Therefore, it＇s difficult to directly apply the conventional marker bed contrast and thickness- circle correlation methods, etc. Moreover, due to the lack of seismic data, it is difficult to carry out the formation correlation and subsequent researches. Purpose： to establish refined correlative research methods aiming at this type of complicated formation, and the classification criteria of formations above Chang3 of Zhenbei area. Method： to calibrate the logging curves of the corresponding wells and identify the petrologic-electricity relations through observation and study of the cores and cast slices of many preliminary prospecting, evaluation and framework wells in the research area. The new combined strata-partition methods of ＂three-coal and three-tuff＂ （three coal layers and three tuff layers which are regionally representative and indicative） have been put forward through individual well-point strata features analysis - divisional research - synthetical contrast study of each zone, and step-by-step analysis. Then they are verified and corrected by using the data and information of developed blocks and the results of previous studies, so as to get gradually perfect. Result： Determine the unconformity between the Triassic and Jurassic strata, and the isochronous framework of above Chang3 strata. Significance： to provide assurance or a guarantee and basis for further study of sedimentary facies and hydrocarbon enrichment laws, at the same time to achieve a breakthrough in horizontal drilling success rate.

关 键 词：地层划分 不整合面 岩电对应 前侏罗系 

分 类 号：TE321[石油与天然气工程—油气田开发工程]