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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (9): 1216-1224.doi: 10.11764/j.issn.1672-1926.2020.04.023

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Research on the sequence stratigraphy of the Shaximiao Formation in Chuanzhong-Chuanxi area, Sichuan Basin

Fu-sen XIAO(),Teng-qiang WEI(),Xiao-juan WANG,Xu GUAN,Chang-jiang WU,Hai-tao HONG   

  1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China
  • Received:2019-12-26 Revised:2020-04-08 Online:2020-09-10 Published:2020-09-04
  • Contact: Teng-qiang WEI E-mail:xiaofs10@petrochina.com.cn;tqwei@petrochina.com.cn

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Abstract:

Fluvial facies is a significant type of hydrocarbon reservoirs in Mesozoic and Cenozoic continental basins in China, while the strata division of fluvial facies has always been a difficult theme. In Chuanzhong-Chuanxi area of Sichuan Basin, Shaximiao Formation developed fluvial facies. Based on the theory of continental high resolution sequence stratigraphy, combined with the principle of point-line-plane, this paper attempted to carry out sequence stratigraphy research on Shaximiao Formation. The results showed that: (1) Shaximiao Formation can be divided into three third-order base-level cycles and five fourth-order base-level cycles. The five fourth-order base-level cycles respectively corresponded to the first member, section 1 in second member, section 2 in second member, section 3 in second member, section 4 in second member of the Shaximiao Formation. (2)The base-level cycle affected the development and superimposed pattern of the source channel. When the base-level was high, the accommodation space was large, the strata got deposited quickly, and the channel was relatively spatial independent with small scale, the mudstone content was large. Differently, when the base-level was low, the strata got deposited slowly, the channel migrated frequently and incised each other, resulting in the formation of large scale channel, and the content of mudstone was relatively low. The sequence stratigraphic classification of Shaximiao Formation not only provided a high resolution isochronous stratigraphic framework, but also has a function of reservoir prediction, which is of great significance for gas exploration and development of the Shaximiao Formation.

Key words: Fluvial facies, Sequence stratigraphy, Base-level cycle, Shaximiao Formation, Sichuan BasinFoundation item:The Science and Technology Project of PetroChina Southwest Oil and Gasfield Company（Grant No. 20190301-17）

CLC Number: 

  • TE122.1

Fig.1

The comprehensive stratigraphic histogram of Jurassic strata(a) and the location of study area(b)"

Fig.2

Formation characteristics of sequence stratigraphic units of channel type (modified after Ref.[26])"

Fig.3

Comprehensive core histogram of channel sandstone of the second member of Shaximiao Formation"

Fig.4

The cross-plot diagram of velocity and GR of the sedimentary stone of Shaximiao Formation in Qiulin area"

Fig.5

The change characteristics of sand and mudstone content controlled by base level cycle（Well H）"

Fig.6

Sequence stratigraphic division of single well in Shaximiao Formation, Chuanzhong area"

Fig.7

Sequence division of Shaximiao Formation and longitudinal change of channel sand in cross-well seismic profile"

Fig.8

Sequence stratigraphic division of Shaximiao Formation in Qiulin area and seismic root mean square attribute section along the stratum"

Fig.9

The sequence evolution pattern, and the characteristics of channel sand development and distribution of the Shaximiao Formation in Chuanzhong-Chuanxi area"

Fig.10

Relationship between the base-level change (A/S ratio) and the channel width"

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