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Characteristics andMain Controlling Factors of Chang-6 Reservoir of Triassic Yanchang Formation in Dalugou Area , Ordos Basin(PDF)

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

Issue:
2008年第02期
Page:
149-155
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Characteristics andMain Controlling Factors of Chang-6 Reservoir of Triassic Yanchang Formation in Dalugou Area , Ordos Basin
Author(s):
HAN Hui-ping1; 3; WU Chun-ying2; 3; JIANG Ji-hui4; LI Yong3; WANG Bao-qing5; JI Hai-kun1
1. Institute o f Exploration and Development, Changqing Oilfield Limited, Xian 710021, Shaanxi, China; 2. No.6 Production Plant, Changqing Oilfield Limited, Xian 710021, Shaanxi, China; 3. School o f Earth Sciences and Resources, Changan University, Xian 710054, Shaanxi, China; 4. Well Logs Company, Changqing Oilfield Limited, Xian 710021, Shaanxi, China; 5. School o f Oil and Gas Resources, Xian Shiyou University, Xian 710065, Shaanxi, China)
Keywords:
Ordos Basin;  Yanchang Formation;  reservoir petrologic characteristic;  pore structure;  physical properties;  diagenesis
PACS:
TE122.2;P618.130.2
DOI:
-
Abstract:
Based on outcrop observation,core description,geophysical logging interpration and other test datum, the petrologic characteristic, pore structure and the physical properties of Chang-6 reservoir of Yanchang formation in the Dalugou exploration area are studied.The result shows that: the Chang-6 reservoir of Yanchang formation in this area is feldspar sandstone with low porosity and permeability; the sandstones can be compositionally classified as immature and high structural maturity; the pores of the reservoir are mostly intergranular pores, intraparticle dissolution pores and moldic pores or relic moldic pores; the characteristics of the pore structure are minor pores and microcrystals; the reservoir is formed by interaction among original terrestrial composition, sedimentary facies and diagenesis; the structure and amount of original terrestrial composition are direct factors leading to good physical property; sedimentary facies is the basic factor that controls the final distribution and space characteristics of reservoir; submerged distributary channels in delta fronts are the favorable sedimentary environment for the formation and development of reservoir; diagenesis plays cardinal role in the quality of reservoir, compaction and cementation mainly led to the tight reservoir and poor physical property, while dissolution makes the reservoir become good.

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Last Update: 2008-06-20