准噶尔盆地南缘中段下组合储层特征及控制因素分析

Hydrocarbon reservoirs and their controlling factors in the lower associations of the middle part of southern Junggar Basin, Xinjiang

关键词:  储层特征  控制因素  方沸石  溶孔  面孔率  准噶尔盆地

Key words:  hydrocarbon reservoir  controlling factor  analcite  dissolution pore  in-plane porosity  Junggar Basin

摘要:

准噶尔盆地南缘中段下部成藏组合主要包括侏罗系和下白垩统。通过对研究区已有的探井取心及野外露头资料的研究,对下白垩统清水河组、上侏罗统喀拉扎组和齐古组3套储层的沉积特征及其控制因素进行了分析研究,认为研究区储层具有较低成分成熟度、低-中等及中等-较好的结构成熟度,压实作用和胶结作用是原生孔隙损失的主要因素。

Abstract:

The lower entrapments in the middle part of southern Junggar Basin, Xinjiang has been less explored for a long time. The excellent conditions for hydrocarbon accumulation in this area have proven to be the favourable risk exploration area. These entrapments tend to be hosted in the Jurassic and Lower Cretaceous strata. The present paper discusses the hydrocarbon reservoirs and their controlling factors in the Lower Cretaceous Qingshuihe Formation, Upper Jurassic Kalazha and Qigu Formations. The hydrocarbon reservoirs in the study area are mostly made up of feldspathic lithic sandstone and lithic arkose which are characterized by low compositional maturity, low to moderate and moderate to high textural maturity, and pervasive calcite and analcite. The main controlling factors influencing the reservoir potential include the contents of the fillings and lithology (grain size). The compaction and cementation are responsible for the loss of the primary porosity.