Diagenetic Characteristics and Evaluation of Lower-Middle Jurassic Reservoirs in Qigu Fault-Fold Belt, Junggar Basin

doi:10.7657/XJPG20200107

Abstract

Abstract:

Several sets of sandstone reservoirs from the Lower-Middle Jurassic strata are well developed in the Qigu fault-fold belt of the southern margin of Junggar basin. Based on the analysis of the outcrop section and drilling data and by using polarized microscope, porosity-permeability analyzer and SEM, the paper analyzes the rock and mineral characteristics, diagenesis, diagenetic facies and physical properties of the sandstone samples from the Lower-Middle Jurassic strata and performs reservoir classification and evaluation. The results show the sandstone from the Lower-Middle Jurassic strata in Qigu fault-fold belt is dominated by feldspathic litharenite and litharenite, which is characterized by medium textural maturity and low compositional maturity. The diagenetic process mainly includes compaction, cementation and dissolution. Different diagenetic facies directly affect the physical properties of the reservoir, which can be divided into low matrix content and weak cementation diagenetic facies, unstable mineral dissolution diagenetic facies, carbonate cementation diagenetic facies and matrix filling-compaction diagenetic facies. The Lower-Middle Jurassic reservoir can be classified into 6 types of 2 categories and some oil and gas reservoirs are tight sandstone reservoirs.

Key words: Junggar basin, Qigu fault-fold belt, Lower-Middle Jurassic, tight sandstone, reservoir classification, diagenetic characteristic, diagenetic stage, diagenetic facies

CLC Number:

TE112.23

GUO Huajun, SI Xueqiang, TANG Xueying, XU Yang, PENG Bo. Diagenetic Characteristics and Evaluation of Lower-Middle Jurassic Reservoirs in Qigu Fault-Fold Belt, Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 46-54.

Figures/Tables 10

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储集层类型		孔隙度/ %	渗透率/ mD	孔喉半径/μm	排驱压力/MPa	主要孔隙类型	成岩相类型	主要发育层位
Ⅰ类常规砂岩储集层	Ⅰ-1类高渗透储集层	25~30	500.00~2 000.00	>10.0	<0.05	剩余粒间孔	少杂基弱胶结成岩相
	Ⅰ-2类中渗透储集层	15~25	50.00~500.00	2.0~10.0	0.05~0.50	剩余粒间孔	少杂基弱胶结成岩相
	Ⅰ-3类低渗透储集层	10~15	1.00~50.00	1.0~2.0	0.50~0.70	剩余粒间孔粒内溶孔	少杂基弱胶结成岩相不稳定碎屑溶蚀成岩相	头屯河组三工河组
Ⅱ类致密砂岩储集层	Ⅱ-1类较致密储集层	8~10	0.10~1.00	0.5~1.0	0.70~0.90	剩余粒间孔粒内溶孔	不稳定碎屑溶蚀成岩相碳酸盐矿物胶结成岩相	西山窑组三工河组八道湾组
	Ⅱ-2类很致密储集层	6~8	0.05~0.10	0.1~0.5	0.90~1.10	粒内溶孔晶间微孔	碳酸盐矿物胶结成岩相杂基充填—压实成岩相	三工河组八道湾组
	Ⅱ-3类超致密储集层	<6	<0.05	<0.1	>1.10	晶间微孔	杂基充填—压实成岩相	八道湾组