Origin of abnormal high pressure and its relationship with hydrocarbon accumulation in the Dina 2 Gas Field, Kuqa Depression  

作　　者：Fengqi Zhang Zhenliang Wang Hongli Zhong Yubin Song Weiming Liu Chi Wei 

机构地区：[1]School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China [2]Department of Geology,Northwest University,Xi’an 710069,China [3]College of Geology&Environment,Xi'an University of Science and Technology,Xi'an 710054,China [4]Tazhong Exploration&Development Research Management Department,Petrochina Tarim Oilfield Company,Korla 841000,China

出　　处：《Petroleum Research》2016年第1期93-102,共10页石油研究（英文）

基　　金：This work was funded by National Science and Technology Major Project of China(Grant No.2008ZX05003,2011ZX05003001).

摘　　要：Based on distribution of formation pressure by indirect estimation and formation testing,this study investigates origin of abnormal high pressure in the Dina 2 Gas Field in the Kuqa Depression in combination with the latest research findings.Contribution of major overpressure mechanisms to this gas field is estimated,and generation of the abnormal high pressure as well as its relationship with natural gas accumulation is explored.Disequilibrium compaction,tectonic stress,and overpressure transfer are the major overpressure mechanisms.Overpressure transfer resulted from vertical opening of faults and folding is the most important cause for the overpressure.Gas accumulation and abnormal high pressure generation in the reservoirs of the Dina 2 Gas Field show synchroneity.During the early oil-gas charge in the Kangcun stage,the reservoirs were generally normal pressure systems.In the Kuqa deposition stage,rapid deposition caused disequilibrium compaction and led to generation of excess pressure(approximately 5-10 MPa)in the reservoirs.During the Kuqa Formation denudation stage to the Quaternary,reservoir overpressure was greatly increased to approximately 40-50 MPa as a result of vertical pressure transfer by episodic fault activation,lateral overpressure transfer by folding and horizontal tectonic stress due to intense tectonic compression.The last stage was the major period of ultra-high pressure generation and gas accumulation in the Dina 2 Gas Field.

关 键 词：abnormal high pressure overpressure transfer tectonic compression Dina 2 Gas Field Kuqa Depression 

分 类 号：P61[天文地球—矿床学]