High-Resolution Sequence Stratigraphy of the First Fault Block, the Second Area of Gangdong Oil Field

CHEN Bo; CHEN Gong Xiang; BAO Ji cheng

Gangdong oil field,claiming a history of 30 years, locates in Huanghua depressio n of Gulf of Bohai basin. Reservoirs of the oil field are to the fluvial facies deposits, and is extremely heterogeneous and layered. The reservoir mostly consists of small striped channel deposits interbedded with flood-plain. It is v ery difficult to correlate reservoirs. High-resolution sequence stratigraphic an alysis can serve directly to high-resolution stratigraphic framework. Fir st fault block, the second area of Gangdong oil fields is selected as the study area. Based on the principle of base-level cycles, two scales of stratigraphic c ycles (short-and intermediate-term) are recognized through the combination of cores and logs data in the area. The short-term stratigraphic cycles, which may be not relate to base-level cycle, are the result of channel avulsion autocyclic process, Five type of channel avulsion auto-cycles are identified. The intermed iate-term stratigraphic cycles correspond to change of base-level cycle, and dif ferent types of the short-term cycles occur in different position of the interme diate-term base-level cycle. The same microfacies has different architecture in different position of the base-level cycle. The base-level cycle directly contro ll the channel reservoir geometry, Within an intermediate-term base-level cycl e, during periods of low accommodation, channel deposits is mostly lateral agg radation, and channel reservoirs superpose and connecte each other. As accomm odation increased, channel reservoirs become progressively isolated within flood -plain mudstone. According to that characterization, high-resolution sequence st ratigraphic framework has been established based on intermediate-term base-level cycle, and using the high-resolution correlation to identify reservoir continui ty and heterogeneities that could divide reservoirs into fluid flow compartments and are the most important factots in controlling the rates and pathways of flu id flow through reservoir.

1 Department of Geology,Jianghan Petroleum Institute,Jinzhou,Hubei 434102;

2 Qinhai Oil field,Huatugou,Qinhai 817500

Received Date: 1998-12-22

Rev Recd Date: 1999-04-06

Publish Date: 2000-06-10

Key words:

Gangdong oil fields /
fluvial facies /
high-resolutio nsequence stratigraphy /
short-term base level intermediate-term base-level cycle /
channel reservoirs /
reservoirs prediction

Abstract: Gangdong oil field,claiming a history of 30 years, locates in Huanghua depressio n of Gulf of Bohai basin. Reservoirs of the oil field are to the fluvial facies deposits, and is extremely heterogeneous and layered. The reservoir mostly consists of small striped channel deposits interbedded with flood-plain. It is v ery difficult to correlate reservoirs. High-resolution sequence stratigraphic an alysis can serve directly to high-resolution stratigraphic framework. Fir st fault block, the second area of Gangdong oil fields is selected as the study area. Based on the principle of base-level cycles, two scales of stratigraphic c ycles (short-and intermediate-term) are recognized through the combination of cores and logs data in the area. The short-term stratigraphic cycles, which may be not relate to base-level cycle, are the result of channel avulsion autocyclic process, Five type of channel avulsion auto-cycles are identified. The intermed iate-term stratigraphic cycles correspond to change of base-level cycle, and dif ferent types of the short-term cycles occur in different position of the interme diate-term base-level cycle. The same microfacies has different architecture in different position of the base-level cycle. The base-level cycle directly contro ll the channel reservoir geometry, Within an intermediate-term base-level cycl e, during periods of low accommodation, channel deposits is mostly lateral agg radation, and channel reservoirs superpose and connecte each other. As accomm odation increased, channel reservoirs become progressively isolated within flood -plain mudstone. According to that characterization, high-resolution sequence st ratigraphic framework has been established based on intermediate-term base-level cycle, and using the high-resolution correlation to identify reservoir continui ty and heterogeneities that could divide reservoirs into fluid flow compartments and are the most important factots in controlling the rates and pathways of flu id flow through reservoir.

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Reference (9)

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High-Resolution Sequence Stratigraphy of the First Fault Block, the Second Area of Gangdong Oil Field

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