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Formation conditions and exploration direction of large and medium gas reservoirs in the Junggar Basin, NW China
Petroleum Exploration and Development ( IF 7.0 ) Pub Date : 2020-04-17 , DOI: 10.1016/s1876-3804(20)60045-3
Suyun HU , Xiaojun WANG , Zhenglin CAO , Jianzhong LI , Deyu GONG , Yang XU

The Junggar Basin is rich in oil but lacks natural gas, which is inconsistent with its geological background of natural gas. Based on the analysis of main source kitchens, and the evaluation of geological setting and controlling factors of gas accumulation, it is proposed that three significant fields for gas exploration should be emphasized. The first field is the Carboniferous volcanic rocks. The Carboniferous residual sags and large-scale reservoirs were developed in three active continental margins, i.e., the southeastern, northeastern and northwestern active continental margins. Gas accumulation is controlled by the favorable reservoir-caprock combinations composed of volcanic rocks and their superimposed lacustrine mudstones in the Upper Wuerhe Formation. Dinan, Eastern and Zhongguai uplifts are three favorable directions for natural gas exploration. The second field is the Lower combinations in the southern margin of Junggar Basin. Rows of structural traps were developed in this area with ideal preservation conditions and space-time configuration for trap-source combinations. Sets of clastic reservoirs and overpressured mudstones formed perfect reservoir-caprock combinations which are the main exploration direction for Jurassic coal-type gas reservoirs in this area. The seven large structural traps in the middle-east section are recently the most significant targets. The last field is the Central Depression. Large hydrocarbon generating centers, i.e., Mahu, Fukang and Shawan sags, were developed in this area, their source rocks were deeply buried and at highly-mature stage. Thus the Central Depression is a favorable exploration direction for Permian high-over mature gas fields (reservoirs). Great attentions should be paid to two types of targets, the deeply–buried structures and structural-lithologic traps. Based on three main gas systems, gas exploration is suggested be strengthened within three fields and on three levels.



中文翻译:

准the尔盆地大中型气藏形成条件与勘探方向

准gar尔盆地富含石油,但缺乏天然气,这与其天然气的地质背景相矛盾。在分析主要气源厨房的基础上,结合对天然气成藏的地质环境和控制因素的评价,提出应重点关注天然气勘探的三个重要领域。第一个领域是石炭纪火山岩。在三个活动大陆边缘,即东南,东北和西北活动大陆边缘,开发了石炭纪残余垂下和大型储层。上乌尔河组中火山岩及其叠合的湖相泥岩组成的有利储集层组合控制了天然气成藏。迪南 东部和中拐隆起是天然气勘探的三个有利方向。第二个字段是准gar尔盆地南缘的下层组合。在该区域开发了成排的结构性圈闭,具有理想的保存条件和时空配置,可用于圈闭-源的组合。碎屑岩和超压泥岩组合形成了完善的储盖组合,是该地区侏罗系煤型气藏的主要勘探方向。最近,中东地区的七个大型结构性圈闭是最重要的目标。最后一个字段是中央大萧条。该地区发展了大型的烃类生烃中心,即麻湖凹陷,阜康凹陷和沙湾凹陷,其烃源岩被深埋并处于高度成熟的阶段。因此,中央De陷是二叠系高架成熟气田(储层)的有利勘探方向。应该高度注意两种类型的目标,即深埋构造和构造岩性圈闭。建议在三个主要的天然气系统的基础上,在三个领域和三个层次上加强天然气勘探。

更新日期:2020-04-17
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