作　　者： ; ; ; ;

机构地区： 中国地质大学北京能源学院

出　　处： 《中外能源》 2011年第8期40-43,共4页

摘　　要： 广安气田是目前四川盆地在上三叠统产层发现的第三大气田。须四段作为其主要储集层之一,岩石类型以长石岩屑砂岩为主,孔隙以粒间和粒内溶孔为主。由于孔隙度和渗透率低,储层物性总体为低孔低渗储层。由于须四段地层水矿化度变化大,导致电阻率变化范围大,气水分布规律复杂,产层段同时存在低阻气层和高阻水层,造成气水层识别的困难。提出一种综合地质和测井的多信息分析技术,分析测井资料的气层响应特征,通过四性关系研究,建立了声波时差与电阻率的图版、孔隙度(准)与电阻率和自然电位(Rt/△SP)的关系交会图版,以及孔隙度(准)与自然伽马和电阻率(△GR/Rt)的关系交会图版,其符合率达到80%以上。通过实例分析,利用岩心、录井、测井、气藏等多方面资料,从地质、气藏的背景下,利用气水层综合识别图版,预测了有利目标井位。 Guang′an gas field is the third biggest gas field in upper Triassic in Sichuan basin.As one of the major reservoirs,the forth member of Xujiahe formation with low permeability and low porosity is mainly composed of feldspar lithic sandstones.And its principal pore types are interparticle pores and intraparticle pores.Great change of salinity of formation water results in large change of resistivity.Because the distribution of gas and water is very complex in this member,there are gas reservoirs with low-impedance but water reservoirs with high-impedance.This abnormal phenomenon makes it difficult in distinguishing gas-bearing formations from water-bearing ones.This paper provides a comprehensive method of multi-information analysis considering geology and well logging.It is applied for analyzing response characteristic of gas-bearing formations of logging information.Type curves of AC-Rt cross plot,-Rt/ΔSP cross plot and-ΔGR/Rt cross plot are established according to four-property relationship.The coincidence rate of these type curves with real data is above 80%.Through a field example,favorable target wells are given using recognition chart of gas-bearing and water-bearing formations with combination of geology and background of gas reservoir based on core,logging and gas reservoir and other information.

关 键 词： 低孔低渗储层 多信息分析技术 测井解释 气水层识别 交会图 有利目标井位

领　　域： [天文地球] [天文地球]