摘要
针对目前英西地区地层非均质强,构造挤压,地层变形强烈,异常高压形成原因不明确,难以选择合适的地层压力预测方法的问题。使用测井、录井与钻井工程计算方法结合的方式,选取典型井狮49-1井作为分析对象,获得该地区存异常高压纵向分布情况。并收集英西地区岩心和录井资料,综合运用沉积学、岩石学等理论和方法,获得英西地区地质沉积过程与裂缝发育情况,发现构造挤压运动、排烃作用、石膏转化作用引起异常压力。同时对比分析声波时差和密度测井数据图,判断其属于孔隙流体膨胀引起高压,符合岩心分析中的排烃作用和石膏转化作用。经过综合分析判断,英西地区异常高压由排烃作用、石膏转化作用和构造挤压三种因素引起,并以此为理论依据选择合适的压力预测模型,预测了邻近井的地层压力,与实际情况符合程度较好,说明了这一理论的可靠性,对英西地区的地层压力预测及钻井工程具有重要的指导意义。
At present,the formations of Yingxi area are characterized by strong heterogeneity,tectonic compression,strong deformation and unclear cause of abnormal high pressure,and it is difficult to select suitable formation pressure prediction method.The well logging,mud logging and drilling engineering calculation methods are applied together to know vertical distribution of the abnormal high pressure in this area selected the typical well Shi49-1 as the analysis object.The core and logging data of Yingxi area are collected,and the theory and method of sedimentology and petrology are synthetically used to obtain the geological sedimentary process and fracture development in Yingxi area.It is found that the abnormal pressure results form tectonic compression,hydrocarbon expulsion and gypsum transformation.At the same time,the acoustic time difference and density logging data are compared and analyzed.It can be concluded that the high pressure results from pore fluid expansion,which is consistent with the hydrocarbon expulsion and gypsum transformation in the core analysis.Through comprehensive analysis and judgment,the abnormal high pressure in Yingxi area is caused by hydrocarbon expulsion,gypsum transformation and tectonic compression three factors.Based on this theory,a suitable pressure prediction model is selected to predict the formation pressure of adjacent wells,which is in good agreement with the actual situation.It shows the reliability of this theory,and it has important guiding significance for the formation pressure predicting and drilling engineering in Yingxi area.
作者
李洪
谯世均
张闯
雷彪
吴玉洁
樊洪海
陶雷
Li Hong;Qiao Shijun;Zhang Chuang;Lei Biao;Wu Yujie;Fan Honghai;Tao Lei(CNPC Engineering Technology R&D Company Limited,Beijing 102206;Drilling and Production Technology Research Institute,PetroChina Qinghai Oilfield Company,Dunhuang Qinghai 736200;School of Petroleum Engineering,China University of Petroleum-Beijing,Beijing 102206)
出处
《中外能源》
CAS
2020年第2期34-38,共5页
Sino-Global Energy
基金
国家自然科学基金项目“深水油气开采期间环空压力预测及释放机理研究”(编号:51874326).
关键词
地层压力
异常高压
形成机制
岩心
测井
formation pressure
abnormal high pressure
formation mechanism
core
well logging
作者简介
李洪,高级工程师,2010年毕业于中国石油大学(北京)油气井专业,现主要从事钻井提速及新技术研发工作。E-mail:lihdri@cnpc.com.cn
