Compound Cap Rocks and Slide Faults Controlling Mechanism on Reservoir and Reserves:An Example on Lower Ordovician Dolostones Exploration in Manxi-Gucheng Area,Tarim Basin
Received date: 2014-10-10
Revised date: 2015-01-25
Online published: 2015-07-10
Well Gucheng 6,which lies in the Gucheng region,obtained industrial gas flow at Lower Ordovician dolostones in 2012,and represented a kind of unconventional reservoir-cap combination and gas accumulation type with great importance on gas exploration.Since reservoirs are mainly controlled by pene-contemptuous dolomitization and hydrothermal alternations,and gases accumulate along slide faults,the reservoir-cap rock combination characteristics and hydrocarbon accumulations in Gucheng 6 were studied.Based on the research of reservoir formation and gas accumulation in well Gucheng 6,double cap rocks and slide faults controlling reservoir and reserves model is suggested,i.e.,hydrothermal fluids upwells along slide faults,then transports horizontally beneath cap rocks completing reservoir constructive reformation at early stage,gas inputs along slide faults and accumulates under cap rocks in gas discharging process.According to the distribution study on the Upper Ordovician mudstone,the Middle Ordovician compact limestones and the slide faults,it is redeemed that Manxi-Gucheng area is advantaged distribution district of combined cap rocks and slide faults,and that northern Manxi Uplift and southern Gucheng Uplift are the most practical area for the Lower Ordovician dolostones explorations.
CHEN Yong-quan,GUAN Bao-zhu,XIONG Yi-xue,KANG Qian . Compound Cap Rocks and Slide Faults Controlling Mechanism on Reservoir and Reserves:An Example on Lower Ordovician Dolostones Exploration in Manxi-Gucheng Area,Tarim Basin[J]. Natural Gas Geoscience, 2015 , 26(7) : 1268 -1276 . DOI: 10.11764/j.issn.1672-1926.2015.07.1268
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