Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (2): 160-169.doi: 10.12108/yxyqc.20240215

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Flow unit division based on SSOM and its production application： A case study of sublacustrine turbidity channels of middle Es3 in F oilfield，Bohai Bay Basin

WANG Ya, LIU Zongbin, LU Yan, WANG Yongping, LIU Chao   

  1. Tianjin Branch of CNOOC China Limited, Tianjin 300452, China
  • Received:2023-02-05 Revised:2023-08-23 Online:2024-03-01 Published:2024-03-06

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Abstract: Based on the classification of reservoir architecture，the relationship between seepage barriers and architecture interfaces of the sublacustrine turbidity channels of the middle third member of Paleogene Shahejie Formation（Es3）in F oilfield of Bohai Bay Basin was summarized，a supervised self-organizing map neural network algorithm was used to quantitatively evaluate flow units，and the distribution of flow units under the control of architecture models was clarified. The results show that：（1）The reservoirs of middle Es3 in F oilfield of Bohai Bay Basin can be divided into four types of flow units，namely type Ⅰ，Ⅱ，Ⅲ and Ⅳ.（2）The flow unit recognition results based on SSOM algorithm show high prediction accuracy，with an overall accuracy of 82.81% for 256 training samples and 80.91% for 110 testing samples，which can meet the needs of geological reservoir research. （3）Vertically，the flow units developed in different types of single channels may vary greatly，resulting in difference of vertical distribution of flow units. The favorable typeⅠand Ⅱ flow units are developed in the middle stage of turbidity channel system evolution，mainly distributed in the category Ⅱ single channels. Type Ⅲ and Ⅳ flow units are developed in the early and late stages of turbidity channel system evolution. Among them，type Ⅲ flow units are widely distributed in category Ⅰ，Ⅱ and Ⅲ single channels，while type Ⅳ flow units are mainly developed in categoryⅠand Ⅲ single channels. Laterally，influenced by the sedimentary evolution stages of channels systems，the lateral division of flow units is different. The contact pattern between the flow units and the nonpermeable layers develops in the early sedimentary cycle of the turbidity channel system，with obvious contact interfaces，which belongs to category Ⅰ channel sand bodies. The contact pattern between the flow units develops in the middle and late sedimentary cycles of the channel system，which belongs to category Ⅱ and Ⅲ channel sand bodies. （4）Horizontally，due to the lateral migration and vertical accretion of single channels，the distribution of flow units in the composite channel was significantly different. The type Ⅲ flow units are developed widely in the single sand body with good continuity between wells，and they are developed in the main turbidity channels，turbidity channels and overflowing sand bodies. The distribution of typeⅠand Ⅱ flow units with good seepage capacity is limited with poor continuity，and they are distributed only in the direction of the main stream line of turbidity channels and the sand bodies of the main channels，showing discontinuous point or ribbon distribution. The Type Ⅳ flow units are distributed in a ring band along the outer edge of type Ⅲ flow units and developed in the area where the turbidity channels overflowed the sand bodies.

Key words: SSOM algorithm, turbidity channel, reservoir architecture, flow unit, self-organizing map neural network, supervised mode, middle Es3, Paleogene, Bohai Bay Basin

CLC Number: 

  • TE345
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