Reservoir Characteristics and Controlling Factors of Shan 1 Member in Qingyang Gas Field, Ordos Basin

doi:10.7657/XJPG20220305

Abstract

Abstract:

In the Qingyang gas field, Ordos basin, which is a typical tight sandstone gas field, the major pay zone is the first member of the Permian Shanxi formation. Its sedimentary sand bodies change rapidly with small thickness, making the prediction of reservoir distribution difficult, which restricts the productivity construction of the gas field. In this paper, sedimentary sand body characterization and thin layer prediction were carried out using logging-seismic combination, the main factors controlling reservoir development were discussed, and favorable reservoir distribution areas were identified. The results show that the paleogeomorphology and paleo-flow direction jointly controlled the distribution of delta sand bodies, the underwater distributary channel sand bodies with developed dissolution facies are the most favorable reservoirs, and the local micro-amplitude nose uplift structure is the natural gas enrichment area. Based on the factors such as sand body distribution, reservoir physical properties, diagenesis and structural characteristics, a set of standards for classifying reservoirs in the study area was established, by which two Type I reservoir enrichment areas were defined in the southern and central parts of the study area.

Key words: Ordos basin, Qingyang gas field, tight sandstone gas reservoir, Shanxi formation, Shan 1 member, reservoir characteristic, controlling factor, enrichment area

CLC Number:

TE132.2

DUAN Zhiqiang, XIA Hui, WANG Long, GAO Wei, FAN Qianqian, SHI Wei. Reservoir Characteristics and Controlling Factors of Shan 1 Member in Qingyang Gas Field, Ordos Basin[J]. Xinjiang Petroleum Geology, 2022, 43(3): 285-293.

Figures/Tables 13

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成岩相类型	成岩相特征	孔隙发育程度	分布位置
强压实致密相	早期压实作用较强,后期成岩改造较弱	低	分流河道、河口坝砂体顶底边缘
强胶结致密相	压实后石英次生加大边发育	低	分流河道或水下分流河道、河口坝砂体的顶底内部
	绿泥石胶结弱,自生石英胶结强	低
	方解石连晶胶结强	极低
	胶结物类型较多,晚期铁方解石将溶蚀孔隙完全胶结	低,发育微裂缝
溶蚀相	成岩作用复杂,溶蚀作用形成的孔隙被较好地保存下来	溶蚀孔隙发育	水下分流河道中—下部、河口坝中—上部
原生孔隙发育相	绿泥石环边胶结发育,原生粒间孔隙保存较好	原生粒间孔隙发育	分流河道中部、河口坝中—上部

储集层类型	亚段	沉积相区带	沉积微相	砂体厚度/m	孔隙度/ %	渗透率/ mD	含气饱和度/ %	有效砂体厚度/m	成岩相带	构造部位	研究区位置	综合评价
Ⅰ类	山1₃	三角洲前缘	水下分流河道中心、水下分流河道侧翼	>10	>5.70	>0.52	>65	>6.5	溶蚀相+绿泥石胶结相区	北部鼻隆、微幅背斜	北部、南部	好储集层
Ⅱ类	山1₂	平原—前缘过渡区	分流河道侧翼、河口坝	8~10	1.88~5.70	0.14~0.52	>60	4.0~6.5	溶蚀相区	中部微幅背斜	中部	中等储集层
Ⅲ类	山1₁	三角洲平原、滨浅湖	分流河道侧翼、滨浅湖	6~8	<1.88	<0.14	>55	<4.0	强压实—胶结,弱溶蚀相区	中—西部斜坡区	东北部	差储集层