新疆石油地质

新疆石油地质 ›› 1998, Vol. 19 ›› Issue (6): 450-452.

• • 上一篇    下一篇

准噶尔盆地腹部石炭系火山岩风化壳模式

张年富, 曹耀华, 况军, 林金凤   

  1. 新疆石油管理局勘探开发研究院 克拉玛依 834000
  • 收稿日期:1998-04-30 发布日期:2020-09-19
  • 作者简介:张年富:高级工程师 石油地质

WEATHERING CRUST MODEL OF CARBONIFEROUS VOLCANIC ROCK IN HINTERLAND OF JUNGGAR BASIN

Zhang Nianfu, Cao Yaohua, Kuang Jun, Lin Jinfeng   

  1. Research Institute of Exploration and Development, Xinjiang Petroleum Administration Bureau, Karamay 834000
  • Received:1998-04-30 Published:2020-09-19
  • About author:Zhang Nianfu, Senior Engineer, Petroleum Geology

PDF

375

摘要： 石炭系火山岩风化壳是准噶尔盆地腹部深层油气勘探的重要目标。根据50 多口井石炭系火山岩风化壳剖面的岩石学及物性特点, 自上而下可将其分为沉积盖层带(A)、风化壳上带(B)、风化壳下带(C)、致密火山岩带(D)。有效的储集空间发育于B 带和C 带。根据火山岩储集层的孔隙成因及火山岩与上下烃源岩的配置关系,可将石炭系火山岩风化壳分为四种模式:火山岩上下无烃源岩, 风化壳以淡水淋滤溶孔为主;火山岩上为烃源岩,下为非烃源岩, 风化壳以淡水溶孔和有机酸溶孔为主;火山岩上为非烃源岩, 下为烃源岩, 风化壳上部以淡水溶孔为主, 下部以有机酸溶孔为主;火山岩上下均为烃源岩, 风化壳中淡水溶孔与有机酸溶孔共存。研究认为, 莫索湾背斜、玛湖背斜、玛南背斜和白家海凸起南部石炭系火山岩风化壳属第四种模式, 为油气勘探的重要目标区。

关键词: 准噶尔盆地, 石炭纪, 火山岩, 储集层, 风化壳, 模式

Abstract: Volcanic rock weathering crust of Carboniferous is the important target for deep oil/gas exploration in hinterland of Junggar basin, which can be divided into sedimentary caprock belt(A), upper weathering crust(B), lower weathering crust(C)and tight volcanic rock belt(D)from top to bottom based on petrology and petrophysical properties of volcanic rock weathering crust from more than 50 wells.Effective pore space exists in B and C belts. According to pore origin of volcanic rock reservoir and its contact with overlying and underlying source rocks, volcanic rock weathering crust in Carboniferous can be divided into four models :①no source rock exists above and below volcanic rock, dominated by freshwater leaching pore ;②source rock occurrs above volcanic rock dominated by freshwater and organic acid denudation pores ;③source rock occurrs below volcanic rock dominated by freshwater denudation pore in upper weathering crust and by organic acid denudation pore in lower weathering crust;④source rock occurrs above and below volcanic rock with co-existence of freshwater and organic acid denudation pores.The study showed that volcanic rock weathering crusts in Carboniferous in Mosuowan anticline, Muhu anticline, Manan anticline and Baijiahai arch identified as the fourth model, are the important targets for oil/gas exploration.

Key words: Junggar basin, Carboniferous, Volcanic rock, Reservoir, Weathering crust, Model