Characteristics and Main Enrichment Controlling Factors of Chang 7 Tight Oil in Xunyi-Yijun Area,Ordos Basin

HOU Juan; HUANG Shuaibo; KE Si; ZHANG Ru

doi:10.19751/j.cnki.61-1149/p.2021.04.013

Northwestern Geology > 2021 > 54(4): 171-179. > DOI: 10.19751/j.cnki.61-1149/p.2021.04.013

HOU Juan, HUANG Shuaibo, KE Si, et al. Characteristics and Main Enrichment Controlling Factors of Chang 7 Tight Oil in Xunyi-Yijun Area,Ordos Basin[J]. Northwestern Geology, 2021, 54(4): 171-179. DOI: 10.19751/j.cnki.61-1149/p.2021.04.013

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Characteristics and Main Enrichment Controlling Factors of Chang 7 Tight Oil in Xunyi-Yijun Area,Ordos Basin

1. Petroleum Research Institute of Henan Oilfield Branch Company SINOPEC, Nanyang 473132, Henan, China;
2. No. 1 Nature Gas Production Factory, North China Company, SINOPEC, Yulin 719000, Shaanxi, China

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Received Date: June 09, 2020
Revised Date: December 20, 2020
Available Online: July 28, 2022
Published Date: December 04, 2021

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Abstract

Abstract

Based on the data of core, well logging and oil test, etc, this paper analyzed the characteristics of tight oil and the main enrichment controlling factors of Chang 7 member through the aspects of reservoir distribution, reservoir performance and fluid properties. It is concluded that the turbidite sand body is developed in Chang 7 member and the reservoir space is tight and mainly with small pores; the crude oil has the good properties of low density, low viscosity, low freezing point, low sulfur and strong fluidity. The Chang 7 source rock is rich in organic matter with the average Ro of 0.78%, which provides a rich material basis for the formation of tight oil. The sand bodies of the Chang 7₁ and Chang 7₂ sub oil formations are thick and widely distributed, in favour of the accumulation of tight oil. However, the development of faults may destroy the accumulation of tight oil. Good preservation condition is necessary for the accumulation of tight oil in this area.
- Chang 7 member of Yanchang Formation,
- tight oil,
- geological characteristics,
- main controlling factors

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Characteristics and Main Enrichment Controlling Factors of Chang 7 Tight Oil in Xunyi-Yijun Area,Ordos Basin

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