岩石矿物学杂志2011，Vol.30Issue(1)：60-70,11.
火山岩气藏储层岩相特征及其对储层物性的影响——以徐深气田徐东地区白垩系营城组一段火山岩为例
Lithofacies characteristics of volcanic gas reservoirs and their influence on reservoir physical properties: a case study of Member 1 of Cretaceous Yingcheng Formation in Xudong area of the Xushen gas field
摘要
Abstract
Taking the volcanic reservoir of Member 1 of Yingcheng Formation in Xudong area of the Xushen gas field as an example, the authors studied lithofacies characteristics of the volcanic gas reservoir and their influences on reservoir physical properties with the purpose of effectively forecasting and exploiting the volcanic reservoir.On the basis of identification of volcanic rock types and recognition of volcanic rock bodies by combining geological data with logging data and seismic data, the authors analyzed volcanic lithofacies characteristics and their relationship with reservoir physical properties and forecast the favorable prospecting areas by using data from wells, sections and plane lithofacies.The results indicate that the volcanic reservoir of the Member 1 of Yingcheng Formation in Xudong area of the Xushen gas field was formed by repeated volcanic eruptions, with the lithologies consisting of 10 types.The rhyolite, rhyolite tuff and sedimentary volcanic breccia played the preponderant role.The eruption type in the study area was cranny-center eruption, and crater and volcanic lithofacies were obviously controlled by ruptures.The volcanic bodies were dominated by craters, and different volcanic lithofacies were developed in different positions of volcanic bodies.The volcanic fades inside the volcanic bodies in the study area can be divided into five types and sixteen sub-facies.The results indicate that the volcanic lithology and its combination constitute the basis of the division of volcanic fades, and the spreading of volcanic fades controls the distribution of gas reservoirs.The reservoir development areas include the lower part and upper part and top overflow sub-facies of overflow facies, splash down sub-facies and air falling sub-facies, middle extrusive sub-facies, exterior sub-facies of extrusive facies and volcanic neck sub-facies of volcanic channels facies.The sub-facies of the volcanic reservoir include volcanic sub-lithfacies of volcanic neck sub-facies, dikes, sills, hydrothermal breccias, inner extrusive sub-facies, middle extrusive sub-facies, exterior sub-facies, splash down sub-facies, pyroclastic flow deposit, base surge deposit, air falling sub-facies, top part overflow facies, upper part overflow facies, middle part overflow facies, lower part overflow facies, epiclasts-bearing volcanogenic sediments and reworked volcanogenic sediments.The explosive facies and overflow facies are most developed facies, and the physical property of the volcanic sub-facies of splash down is the best.The average effective porosity is 9.00％ and the average whole permeability is 4.793 mD.Volcanic lithology and its combination form the basis of the division of volcanic lithofacies.The distribution of volcanic lithofacies control the development characteristics of volcanic reservoirs.The reservoir development areas are lower part and upper part and top overflow sub-facies of overflow facies, splash down sub-facies, air falling sub-facies, middle extrusive sub-facie, exterior sub-facies of extrusive facies and volcanic neck sub-facies of volcanic channels facies.关键词
徐东地区/营城组/火山岩/储层/岩相/火山岩体分类
天文与地球科学引用本文复制引用
陈欢庆,胡永乐,冉启全,闫林,孙作兴..火山岩气藏储层岩相特征及其对储层物性的影响——以徐深气田徐东地区白垩系营城组一段火山岩为例[J].岩石矿物学杂志,2011,30(1):60-70,11.基金项目
国家科技重大专项资助项目(2008ZX05016-001) （2008ZX05016-001）
中国石油勘探开发研究院中青年创新基金资助项目(2009-B-10-03) （2009-B-10-03）
