Sand Body Architecture of Chang 9 Member in Jiyuan Area,Ordos Basin

doi:10.7657/XJPG20220306

Abstract

Abstract:

In order to clarify the spatial configuration of sand bodies under the dual-provenance background in Chang 9 member in Jiyuan area,Ordos basin,the sedimentary characteristics of Chang 9 member were determined by using the core,logging,test and production data. On this basis,the sand body architecture of Chang 9 member was dissected level by level to understand the development of sand bodies under the dual-provenance background and to characterize the architectural elements and their assemblage and distribution. The results reveal that there are 8 types of skeleton architectural elements in Chang 9 member,which are different from region to region: braided channel,abandoned channel and cross-bank deposits dominated by underwater distributary channel and interdistributary bay in the west; and estuary sand bar,front sheet sand and underwater natural levee in the east. On the plane,the architectural element of braided channel extends farther with continuous distribution,the architectural element of abandoned channel extends shortly with intermittent distribution,the architectural element of underwater distributary channel extends farther with discontinuous distribution,and the architectural element of estuary sand bar is usually in the side rear of the underwater distributary channel with poor continuity. Vertically,the superimposition and assemblage of the architectural elements of skeleton sand bodies become worse from bottom to top,and the architectural elements of braided river delta system in the west display better development scale and degree than those of meandering river delta system in the east.

Key words: Ordos basin, Jiyuan area, Yanchang formation, Chang 9 member, sand body architecture, architectural element, architecture distribution pattern

CLC Number:

TE122.221

WU Zemin, KE Xianqi, ZHANG Pan, WEN Fengqin, TONG Qiang, LIU Linyu. Sand Body Architecture of Chang 9 Member in Jiyuan Area,Ordos Basin[J]. Xinjiang Petroleum Geology, 2022, 43(3): 294-309.

Figures/Tables 17

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沉积相	亚相	主要微相	分布位置
辫状河三角洲	辫状河三角洲平原	分流河道（辫状河道）	西部
		天然堤、决口扇
		分流间洼地、泥炭沼泽
	辫状河三角洲前缘	水下分流河道	中部
		水下天然堤
		分流间湾
曲流河三角洲	曲流河三角洲前缘	水下分流河道	东部
		水下天然堤
		河口坝
		分流间湾
辫状河/曲流河三角洲共同作用	三角洲前缘	水下分流河道	南部
		分流间湾
		水下天然堤
		席状砂
		河口坝

构型要素	自然电位系数	自然伽马系数	电阻率系数	声波时差系数	密度系数	光电吸收截面指数系数	泥质含量系数	加权常数
辫状河道	-0.009	0.506	0.105	7.527	1 296.9	1.408	-5.806	-2 414.9
废弃河道	-0.017	0.511	0.104	7.556	1 303.1	1.369	-5.813	-2 436.4
越岸沉积	-0.019	0.494	0.178	7.432	1 298.7	2.878	-5.312	-2 420.8
水下分流河道	-0.045	0.379	0.096	7.587	1 314.4	0.808	-5.745	-2 458.9
分流间湾	-0.043	0.353	0.128	7.524	1 305.2	2.486	-5.160	-2 448.6
河口坝	-0.053	0.448	0.103	7.483	1 307.4	1.585	-5.658	-2 427.3
前缘席状砂	-0.034	0.327	0.119	7.635	1 327.0	1.788	-5.457	-2 511.8
水下天然堤	-0.022	0.325	0.115	7.578	1 321.0	1.638	-5.432	-2 483.2