|Table of Contents|

Controlling Effect of Source-reservoir Structure in Tight Reservoir on Oil-bearing Property—A Case Study of Chang-6-Chang-8 Members in Heshui Area of Ordos Basin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第03期
Page:
267-280
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Controlling Effect of Source-reservoir Structure in Tight Reservoir on Oil-bearing Property—A Case Study of Chang-6-Chang-8 Members in Heshui Area of Ordos Basin, China
Author(s):
YAO Jing-li1;  ZENG Jian-hui2; 3;  LUO An-xiang1;  YANG Zhi-feng2; 4;  DENG Xiu-qin1
(1. Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, China; 2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; 3. College of Geosciences, China University of Petroleum, Beijing 102249, China; 4. Postdoctoral Research Workstation, Xinjiang Oilfield Company, PetroChina, Karamay 834000, Xinjiang, China)
Keywords:
source-reservoir structure;  lithological association;  type of migration pathway;  oil-bearing property;  tight reservoir;  fracture;  Heshui area;  Ordos Basin
PACS:
P618.13
DOI:
-
Abstract:
Chang-6-Chang-8 members of Ordos Basin are typical tight oil distribution area in China. Tight contact between source and reservoir is a typical characteristic and reservoir forming condition of tight oil. Tight oil layers are highly heterogeneous, and oils mostly migrate with short vertical distances. Previous studies show that the heterogeneity of reservoir is an important factor affecting the distribution of remaining oil in Heshui area of Ordos Basin. However, there are few studies on the influencing factors of reservoir oil-bearing property. The source-reservoir structure of Chang-6-Chang-8 members in Heshui area and its relation with oil-bearing property were analyzed, and the controlling effect on oil-bearing property was studied. The results show that the source-reservoir structure is complicated in Chang-6-Chang-8 members of Heshui area; the lithological association types of source-reservoir in Chang-6-Chang-8 members are self-sourced oil reservoirs, and the source rocks are closely adjacent to the reservoirs, and can be subdivided into six types, including source rocks interbedded by reservoirs, equally interbedded between source rocks and reservoir, reservoirs interbedded by source rocks, direct contact between source rocks and reservoir, gradual transition of source rocks and reservoirs, and source rocks separated from reservoirs; the type of source rocks interbedded by reservoirs shows the best oil-bearing property in Chang-7 member, whereas the type of direct contact between source rocks and reservoir shows the best oil-bearing property in Chang-6 and Chang-8 members, which are most favorable for tight oil accumulation; the oil migration pathway combination of kerogen network→organic pore+structural fracture develops in source rocks of Chang-7 member, and the oil migration pathway combination of kerogen network+structural fracture→pore+microfracture develops in reservoirs of Chang-6 and Chang-8 members, providing favorable migration network for tight oil charging.

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Last Update: 2019-05-20