Reservoir Characteristics and Influence Factors of Gravel Sandstone:Case Study of Upper Triassic Karamay Formation in Hongshanzhui Area

doi:10.19657/j.geoscience.1000-8527.2019.06.05

Abstract

Abstract:

To search for effective reservoirs, data of the core, reservoir physical properties, thin-section, SEM and mercury test results from the Upper Triassic Karamay reservoirs of Hongshanzui area were compiled and analyzed, and the reservoir features and controlling factors were discussed. The results show that the reservoirs are mainly lithic arkose and feldspathic litharenite, and that the component maturity is low. The controlling factor analysis suggests that the sedimentary elements (matrix content, lithic and formation of gravel sandstone) are the internal reason. The matrix content is inversely related to physical properties, tractive current is better than flooding current, and the debris current is the worst. Diagenesis (compaction, cement, dissolution) is the external reason. Compaction results in poor pore structure of gravel sandstone. Cementation is destructive in both rich-matrix and containing-matrix conditions, but protective in poor-matrix ones. The four kinds of reservoirs were divided based on the characteristics and controlling factors, and the favorable reservoir distributions were plotted. The reservoir property is likely better in the inner zone of the fan delta than the external zone, whereas the plain is the worst.

Key words: Hongshanzui area, Upper Karamay Formation, reservoir characteristics, lithofacies, diagenesis

CLC Number:

TE122.2

YAO Zongquan, YU Xinghe, YUE Hongxing, , ZHOU Lihua, WANG Jin, GAO Yang. Reservoir Characteristics and Influence Factors of Gravel Sandstone:Case Study of Upper Triassic Karamay Formation in Hongshanzhui Area[J]. Geoscience, 2019, 33(06): 1188-1198.

Figures/Tables 14

Fig.1 Location and stratigraphic columns of Hongshanzhui area,Junggar Basin

Fig.2 Detrital composition and lithology histogram of the Upper Karamay Formation,Hongshanzhui area

Table 1 Major pore types of the Upper Karamay Formation

孔隙类型		成因	特征	含量/%
原生孔隙	原生粒间孔	原生粒间孔隙未被杂基和胶结物充填	颗粒点线接触,孔隙边缘规则	13.8
原生孔隙	残余粒间孔	颗粒间有部分填隙物	看不到溶蚀迹象	38.1
次生孔隙	溶蚀填隙物内孔隙	粒间孔隙遭受溶蚀后形成	颗粒边缘溶蚀,呈不规则状	15.5
	粒内溶孔	碎屑颗粒内部可溶矿物溶蚀形成	颗粒部分或全部溶蚀	20.6
	裂缝孔隙	构造应力作用或碎屑颗粒成岩收缩产生	缝壁平直,物溶蚀迹象	8.4

Fig.3 Pore and throat types of the Upper Karamay Formation

Fig.4 Types of mercury penetration curves of the Upper Karamay Formation

Fig.5 Histogram of porosity and permeability of the Upper Karamay Formation

Fig.6 Statistical diagram of different matrix contents of reservoir property

Fig.7 Lithologic and physical cross-section

Fig.8 Relationship diagram between matrix content and physical response of different genetic conglomerate reservoirs of the Upper Karamay Formation,Hongshanzhui area

Fig.9 Diagenetic and structural factors on pore structure of the Upper Karamay Formation,Hongshanzhui area

Fig.10 Impact of compaction and cementation on pore evolutionof the Upper Karamay Formation,Hongshanzui area

Fig.11 Reservoir pore evolution pattern of the Upper Karamay Formation,Hongshanzui area

Fig.12 Reservoir characteristics of the Upper Karamay Formation in Hongshanzhui area

Fig.13 Favorable reservoir distribution of Upper Karamay Formation in Hongshanzhui area

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