Diagenetic Facies Division of Chang 8 Tight Sandstone Reservoirs in Eastern HQ Block，Longdong Area

doi:10.7657/XJPG20230401

Abstract

Abstract:

To determine the diagenetic facies and their evolution patterns of the Chang 8 tight sandstone reservoir in the eastern part of the HQ block in the Longdong area of the Ordos basin, the diagenetic facies and logging facies of the cores from individual sand layers were divided by using the data of cast thin section, rock property, coring, and logging. Then, the diagenetic facies of the Chang 8 reservoir were classified with the dominant facies method, the favorable diagenetic facies for oil and gas exploration were determined, and the distribution zones of favorable diagenetic facies were predicted. Considering the diagenetic influences, the diagenetic facies of target layers can be classified into five categories: facies of residual intergranular pores and feldspar dissolution, facies of chlorite-cemented residual intergranular pores, strongly chlorite-illite cementation facies, authigenic carbonate cementation facies, and clay matrix compaction facies. The facies of residual intergranular pores and feldspar dissolution is the most favorable for hydrocarbon accumulation in the study area. Generally, the favorable diagenetic facies distribute as strips with good continuity and in large areas. The central and east-central parts of the study area are the main development zones for favorable diagenetic facies belts.

Key words: Ordos basin, Longdong area, HQ block, Yanchang formation, Chang 8 member, reservoir characteristic, diagenetic facies, favorable facies belt

CLC Number:

TE122.21

PENG Xiaoyong, LIU Guoli, WANG Bing, WEI Tao, REN Lijian, WANG Wei, REN Jiangli. Diagenetic Facies Division of Chang 8 Tight Sandstone Reservoirs in Eastern HQ Block，Longdong Area[J]. Xinjiang Petroleum Geology, 2023, 44(4): 383-391.

Figures/Tables 9

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Table 1.

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面孔率/ %	粒间孔占比/%	填隙物含量/%	成岩相类型
>2.0	<65		长石溶蚀相
	≥65		绿泥石胶结剩余粒间孔相
	≥65		剩余粒间孔相
≤2.0		≤10	绿泥石与伊利石强胶结相
		≤10	自生碳酸盐胶结相
		>10	黏土杂基压实相