Diagenesis Characteristics and Quantitative Analysis of Porosity Evolution of Reservoir of Shan23 Formation in Su77-Zhao51 Well Region,Ordos Basin

Abstract

Abstract:

Taking advantage of the experiment of scanning electron microscopy,the casting thin section,high pressure Hg injection,X-ray diffraction and physical properties,this paper have studied the reservoir essential characteristics,including diagenesis types and intensity,porosity evolution of Shan₂³ Formation in Su77-Zhao51 well region in the Ordos Basin.The results show that there are mainly two rock types,i.e.quartz sandstone and lithic quartz sandstone,both of which have high compositional maturity and low structural maturity.In addition, the pore type is mainly dissolution pore,while the residual intergranular pore and intercrystalline pore take the second place.After undergoing moderate-strong degree compaction,moderate cementation and strong dissolution,the reservoir is now in the phase B of the middle diagenetic stage,part of which is in the late diagenetic stage.The compaction and cementation result in destroying primary pores,leading to the loss of porosity by 16.94% and 14.29%, respectively.The intercrystalline pore and dissolution make porosity increase by 0.92% and 5.64% so that the reservoir property is improved.The pore space experienced a complex evolutionary process:reduction of primary pore→development of secondary pore→reduction of secondary pore→coexistence of mixture pore.

Key words: Su77-Zhao51 well region, Shan₂³ Formation, diagenesis, porosity evolution

CLC Number:

WANG Xiaochen, LUO Jinglan, LI Wenhou, WANG Ruogu, TANG Qiyin. Diagenesis Characteristics and Quantitative Analysis of Porosity Evolution of Reservoir of Shan₂³ Formation in Su77-Zhao51 Well Region,Ordos Basin[J]. Geoscience, 2017, 31(03): 565-573.

Figures/Tables 7

Fig.1 Tectonic unit division and schematic map of the study area

Table 1 Main pore types and their contribution to the surface porosity in the study area(%)

名称	粒间孔	溶孔			晶间孔	微裂缝	面孔率
名称	粒间孔	粒间溶孔	岩屑溶孔	粒内溶孔	晶间孔	微裂缝	面孔率
含量	1.158	1.216	0.244	0.188	0.762	0.058	3.626
对面孔率的贡献率	31.94	33.53	6.73	5.18	21.01	1.60

Fig.2 Main pore types and pore assembly types of Shan23 reservoir in the study area

Fig.3 Main diagenetic types of Shan23 reservoir sandstones in the study area

Fig.4 Diagenetic evolution sequence of Shan23 reservoir in the study area

Table 2 Quantitative statistics of diagenesis and pore evolution of different rock types of Shan23 reservoir(%)

岩性	初始孔隙度	压实损失孔隙度	胶结损失孔隙度	晶间孔增加孔隙度	溶蚀增加孔隙度	最终孔隙度	实测孔隙度	误差
石英砂岩	32.17	16.79	14.25	1.05	5.53	7.70	7.98	0.28
岩屑石英砂岩	32.17	17.04	14.49	0.67	5.61	6.92	6.91	0.01
岩屑砂岩	32.17	17.54	14	0.75	6.46	7.84	8.21	0.37
整体平均值	32.17	16.94	14.29	0.92	5.64	7.50	7.73	0.23

Fig.5 Porosity evolution model of Shan23 reservoir in the study area

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Diagenesis Characteristics and Quantitative Analysis of Porosity Evolution of Reservoir of Shan₂³ Formation in Su77-Zhao51 Well Region,Ordos Basin

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