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2010•Journal of GeomechanicsRequires access

SEDIMENTARY SYSTEM FOR THE SECOND MEMBER OF SHAHEJIE FORMATION,BONAN SAG

Gang Peng

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Abstract

According to the theories of sequence stratigraphy,with the object of understanding genetic facies of the well cores,a study of fan delta sedimentary system has been made to discuss the main characteristics of reservoir rocks based on subdivision and correlation of the second member of Shahejie Formation.The results suggested that this member is well developed in the interior of Bonan sag,but lacks its lower part in the marginal parts because of uplift and insufficient supply source.In the study area,the second member of Shahejie Formation is formed in shallow-water lake and composed of fan delta deposits.In western and northern parts of the area,it occurs as small-scale near-shore subaqueous fan deposits.The reservoir rocks in the member are mainly siltstone,sandstone and pebbly sandstone indicative of fan-delta front edge.In southeast part of the area,the reservoir displays favorable physical properties and is closely related with oil and gas accumulation.

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What this paper is about

According to the theories of sequence stratigraphy,with the object of understanding genetic facies of the well cores,a study of fan delta sedimentary system has been made to discuss the main characteristics of reservoir rocks based on subdivision and correlation of the second member of Shahejie Formation.The results suggested that this member is well developed in the interior of Bonan sag,but lacks its lower part in the marginal parts because of uplift and insufficient supply source.In the study area,the second member of Shahejie Formation is formed in shallow-water lake and composed of fan delta deposits.In western and northern parts of the area,it occurs as small-scale near-shore subaqueous fan deposits.The reservoir rocks in the member are mainly siltstone,sandstone and pebbly sandstone indicative of fan-delta front edge.In southeast part of the area,the reservoir displays favorable physical properties and is closely related with oil and gas accumulation.

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Available abstract

According to the theories of sequence stratigraphy,with the object of understanding genetic facies of the well cores,a study of fan delta sedimentary system has been made to discuss the main characteristics of reservoir rocks based on subdivision and correlation of the second member of Shahejie Formation.The results suggested that this member is well developed in the interior of Bonan sag,but lacks its lower part in the marginal parts because of uplift and insufficient supply source.In the study area,the second member of Shahejie Formation is formed in shallow-water lake and composed of fan delta deposits.In western and northern parts of the area,it occurs as small-scale near-shore subaqueous fan deposits.The reservoir rocks in the member are mainly siltstone,sandstone and pebbly sandstone indicative of fan-delta front edge.In southeast part of the area,the reservoir displays favorable physical properties and is closely related with oil and gas accumulation.

Key concepts: Geology, Siltstone, Facies, Sedimentary rock, Delta, Outcrop, Lithology, Sedimentary depositional environment

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