塔北地区二叠系火山岩岩性特征及油气勘探前景

doi:10.11743/ogg20110606

摘要/Abstract

摘要：

塔北地区二叠系火山岩分布较广,HT1井火山岩试油结果确认了该地区火山岩的含油性。作者重点论述了塔北地区二叠系火山岩的电性特征和岩性-岩相平面、纵向分布特征与火山岩储集空间类型。研究表明艾丁-托甫台-哈德逊地区主要为巨厚层块状喷溢相的英安岩和玄武岩,岩性相对单一,横向稳定。多井分析化验资料表明塔河地区火山岩次生孔隙及裂缝发育,储集性能较好。岩心测试结果显示了火山岩储层低孔低渗的特性,储层物性主要取决于裂缝、溶孔和孔隙的配套。结合该地区火山岩油气藏的成藏模式,认为该地区火山岩中存在背斜、地层等圈闭类型,三叠系柯吐尔组巨厚层纯泥岩直接覆盖在火山岩之上,构成良好的储盖组合,使得该地区火山岩具备有利的成藏条件,勘探前景广阔。通过老井复查,提出了两口井的重新测试建议,希望在塔北地区二叠系火山岩的勘探取得突破。

关键词: 岩性, 岩相, 火山岩, 二叠系, 成藏模式, 油气前景, 塔北地区

Abstract:

Permian volcanic rocks are widely distributed in northern part of Tarim Basin,and well test results of the volcanic reservoirs in well HT1 confirm their oil bearing in this area.The author mainly discussed the electrical characteristics of the volcanic rocks,horizontal and vertical distribution of the lithology-facies and pore types of the volcanic rocks.The study showed the thick and massive dacite and basalt of effusive facies were dominated in Aiding-Tuoputai-Hadexun area,which are relatively homogeneous in lithogy and stable in lateral distribution.Well data indicate that the Permian volcanic rocks in Tahe oilfield are of well-developed secondary pores and fractures.Core test results show that the volcanic reservoirs have low porosity and low permeability.The reservoir properties mainly depend on the combination of fractures,vugs and pores.Combined with hydrocarbon accumulation model of volcanic reservoirs in this area,it is believed that anticlines and stratigraphic traps exist in the volcanic rocks.The volcanic rocks and directly overlapping thick mudstone of Triassic Ketuer Formation form better reservoir-seal system.The volcanic rocks have favorable conditions for hydrocarbon accumulation and good potential for petroleum exploration.Based on re-evaluation of the drilled wells,the re-testing work of two wells is presented in order to promote exploration development of Permian volcanic rocks in Northern Tarim Basin.

Key words: lithology, facies, volcanic rock, Permian, hydrocarbon accumulation model, explorationm potential, northern Tarim Basin

中图分类号:

TE122.1

李彬,贺凯,吕海涛,等. 塔北地区二叠系火山岩岩性特征及油气勘探前景[J]. 石油与天然气地质, 2011, 32(6): 851-858. doi: 10.11743/ogg20110606 Li Bin,He Kai,Lü Haitao,et al. Lithologic characteristics and petroleum exploration potential of the Permian volcanic rocks in northern Tarim Basin[J]. Oil & Gas Geology, 2011, 32(6): 851-858. doi: 10.11743/ogg20110606

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