Title: Genetic Types of the Tight Sandstone Gas Reservoirs in the Kuqa Depression,Tarim Basin,NW China
Abstract: To further understand the genetic types of the tight sandstone gas reservoirs in Kuqa depression,the core from tight sandstone gas reservoirs is sampled to carry out the analysis on hydrocarbon charge history and porosity evolution.The hydrocarbon charge history is investigated by analyzing the fluid inclusion petrography,and microther mometry and the porosity evolution is restored by using the model of deposition-structure-diagenesis.Combining with gas-water relationship and distribution of tight sandstone gas reservoirs.There are two charge events in the YN2 Jurassic tight sandstone reservoir,with the one of oil charge during 23-12 Ma,and the other gas charge during 5-0 Ma.The reservoir porosity dropped to less than 12% and became tight during the period of 12-8 Ma.Two charge events have been recorded in the DN2 Paleogene tight sandstone reservoir;the former is oil charge during 23-12 Ma,and the latter is the gas charge during 5-0 Ma.The reservoir porosity dropped to less than 12% during the period of 2-0 Ma and became tight later.Two genetic types of tight sandstone gas reservoirs have been confirmed.The YN2 Jurassic tight sandstone reservoir is of the genetic type of tight deep basin gas reservoirwith the accumulation process of gas charge after the reservoir tightened and the DN2 Paleogene tight sandstone reservoir is defined as tight conventional gas reservoirwith the accumulation process of gas charge before the reservoir tightened.This study is of significance for further exploration and exploitation of tight sandstone gas in Kuqa depression.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 7
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