古潜山地层岩性分析与储层评价

近年来随着油气资源需求的增加和勘探开发难度的增大,古潜山油气藏研究已成为辽河油田油气勘探开发的重要领域。测井评价的难点包括:①岩石骨架矿物成分变化大,岩性测井划分困难;②储集空间以次生孔隙为主,裂缝发育,储层识别率低;③缺乏有效的裂缝性储层参数计算方法,包括裂缝孔隙度以及储层饱和度等;④裂缝型储集空间内流体类型的识别和评价依然是一个世界性难题。本文研究重点是①与②,在常规测井评价方法的基础上,充分利用ECS、成像等测井新技术,学习和借鉴国内外先进的技术和经验,建立完善复杂的岩性识别方法及储层评价方法例如:测井曲线响应值法、交会图法、ECS测井分析、多矿物组分分析(Optima程序)等;在准确识别岩性的基础上,提高对该类储层的认识,进而提高古潜山储层的测井解释符合率,减少不必要的施工费用,提高经济效益。

LITHOLOGY ANALYSIS AND RESERVOIR EVALUTATION IN QIANSHAN FORMATION

Recently,as the demands for oil and gas resources increase and exploration and development are more difficult,research of the ancient Qianshan reservoirs has hecome the important field of Liaohe oilfield.Difficulties in Well logging evaluation include:①mineralogical components of rock matrix change a lot.It is hard to divide by lithologic logging;②induced porosity dominates reservoir space.Fractures develop and reservoir discrimination is low;③computation method for fracture reservoir parameters is deficient,including fracture porosity and reservoir saturation,etc.;④identification and evaluation of fluid types in fracture reservoir space is still a worldwide problem.The paper lays stress on①and②.On the basis of conventional logging evaluation methods,more perfect and complcated lithologic identification methods and reservoir evaluation methods are established by using ECS and imaging well logging technology and learning.from advanced technologies and experiences both at home and abroad.For example,logging curves response value method,cross-plot,ECS logging analysis, multi-mineral constituents analysis(Optima program)etc.;to improve reservoir knowledge on the basis of accurate lithology identification, in turn to raise the coincidence rate of well logging interpretation of Qianshan reservoir,to reduce unnecessary operation cost and improve economic benefit.