Sedimentary Characteristics and Connectivity of Upper Wuerhe Formation in Wellblock Ke 75, Karamay Oilfield

doi:10.7657/XJPG20220406

Abstract

Abstract:

The upper Wuerhe formation in Wellblock Ke 75 in Karamay oilfield, Junggar basin has strong heterogeneity and varying connectivity between adjacent wells, and the understanding of sand body distribution in the formation is greatly different from the previous one. It is necessary to study the sedimentary facies and sand body connectivity to clarify reservoir distribution. Taking the upper Wuerhe formation in the Wellblock Ke 75 as an example, the characteristics and styles of the 4th-order architectural elements for each subfacies belt of alluvial fan controlled by both debris flow and braided channel were discussed according to the principles of sedimentology, and the sedimentary characteristics and sand body connectivity of each architectural style were analyzed. The research shows that when the electrical properties and sedimentary cycle characteristics of neighboring wells in the sheet flow zone at fan root are consistent, the sand body connectivity is good, and when the cross flow sand bodies or cross flow fine-grained sediments are developed, the sand body connectivity is poor, leading to difficulties in forming effective reservoirs. The research confirmed a Class I favorable gas reservoir area in the Wellblock Ke 75 in Karamay oilfield.

Key words: Junggar basin, Karamay oilfield, upper Wuerhe formation, heterogeneity, reservoir, alluvial fan, sedimentary architecture, sand body connectivity

CLC Number:

TE122.21

LIU Nianzhou, LI Bo, ZHANG Yi, WU Min, WANG Quan, SU Hang. Sedimentary Characteristics and Connectivity of Upper Wuerhe Formation in Wellblock Ke 75, Karamay Oilfield[J]. Xinjiang Petroleum Geology, 2022, 43(4): 417-424.

Figures/Tables 8

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Table 1.

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亚相	5级构型要素	4级单砂体构型要素	岩性	沉积构造
扇根	槽流带	槽流砂砾岩	粗—中砾岩、砂砾岩	块状定向排列
	片流带	片流砂砾岩	中—细砾岩、砂砾岩	递变层理
	漫洪带	漫洪砂体	中—细砂岩不等粒砂岩、含砾砂岩	交错层理
	漫洪带	漫洪细粒沉积	粉砂岩、含砾砂岩、砂质泥岩、泥岩	块状排列
扇中	辫流带	辫流水道砂体	砂砾岩、粗砂岩	交错层理、平行层理
	漫流带	漫流砂体	细砂岩、不等粒砂岩、含砾泥质砂岩	波状层理、沙纹层理
	漫流带	漫流细粒沉积	泥质粉砂岩、砂质泥岩、含砾泥岩、泥岩	块状叠加
扇缘	径流带	径流水道砂体	砂砾岩、中—细砂岩	交错层理、平行层理
	漫流带	漫流砂体	细砂岩、泥质砂岩	波状层理
	漫流带	漫流细粒沉积	泥质粉砂岩、泥岩	块状堆积