Characteristics and Development Pattern of Pre-Mesoproterozoic Carbonate Subduction Reservoirs in the Qiaogu Area of the Tabei Uplift

doi:10.19657/j.geoscience.1000-8527.2022.048

Abstract

Abstract:

The buried hill formation of the pre-Mesozoic in Qiaogu area is the key area for the breakthrough of oil and gas exploration in Tabei Uplift, Xinjiang.The buried hill strata in this area are deep and complex in distribution, the reservoir is highly heterogeneous and strongly transformed by late fluid activity, and the law of oil and gas enrichment is unclear, which seriously restricts regional oil and gas exploration and target selection.In order to find out the characteristics of buried hill reservoir and the main controlling factors of reservoir development and establish the reservoir development model, the reservoir characteristics and controlling factors were systematically studied by using core, drilling and logging data and seismic data.The results show that the pre-Mesozoic reservoir lithology in Qiaogu area is mainly composed of three types: crystalline dolomite, siliceous dolomite and granular dolomite.The reservoir space is dominated by fractures, followed by dissolved pores, and locally developed karst caves.The physical properties of different lithofacies are obviously different. Fine silty dolomite, calcareous silty dolomite and sand-clastic micritic dolomite reservoirs are well developed, and the reservoir matrix has good physical properties.Micritic dolomite and siliceous dolomite are relatively compact and non-reservoir with poor physical properties.Based on the above research, the reservoir development model of the inner buried hill in Qiaogu area is extracted, that is, the reservoir development is mainly controlled by lithofacies, faults and burial-hydrothermal interaction, among which lithofacies is the material basis of reservoir development, faults are the key factors of reservoir development, and burial-hydrothermal transformation of reservoir development is superimposed.Compared with the reservoir unit characteristics of the target strata, there are five sets of small development strata in the upper member of the Xiaerbulak Formation, among which the first, third and fourth development strata have good reservoir physical properties and reservoir-cap combination, which are the preferred key targets for future oil and gas exploration and target areas.

Key words: Tabei uplift, Qiaogu area, pre-Mesozoic, subduction reservoir characteristic, reservoir development pattern

CLC Number:

LIU Qian, FAN Tailiang, GAO Zhiqian, ZHANG Tonghui, MA Xiaoxuan, WEI Duan, LU Xinbian. Characteristics and Development Pattern of Pre-Mesoproterozoic Carbonate Subduction Reservoirs in the Qiaogu Area of the Tabei Uplift[J]. Geoscience, 2022, 36(05): 1391-1402.

Figures/Tables 12

Fig.1 Location map of the study area (after ref.[13])

Fig.2 Rock types of buried hill layers in Qiaogu area

Table 1 Display characteristics of different reservoir space types on electrical imaging logging images

储集空间类型	成像测井图像显示特征	分布情况
裂缝	深色或黑色的正弦曲线	研究区均有发育
溶孔	深色或黑色的不规则斑块, 多数与裂缝相伴而生	研究区少量发育
溶洞	极板全是黑色条带夹局部亮色团块	研究区欠发育

Fig.3 Interpretation charts of electrical imaging logging in Qiaogu area

Fig.4 Fine depiction of the reservoir space in the upper Xiao member of well QG1

Fig.5 Integrated reservoir histogram of the upper Xiao member of well QG1

Fig.6 Box plot of porosity distribution of different lithofacies in Qiaogu area

Table 2 Statistics of lithologic porosity in Qiaogu area

岩石类型	样品数/个	面孔率分布区间/%	平均面孔率/%
泥晶白云岩	33	0.004~0.609	0.217
粉晶白云岩	25	0.030~2.871	0.697
灰质粉晶白云岩	2	0.216~0.672	0.444
砂屑泥晶白云岩	4	0.216~0.672	0.479
硅质白云岩	4	0.126~0.625	0.378

Fig.7 Reservoir unit division in the upper Xiao member of well QG1

Fig.8 Reservoir connection profile of well QG1-QG101-QG102

Fig.9 Reservoir space types of buried hill reservoirs in Qiaogu area

Fig.10 Reservoir development model in Qiaogu area

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