Sandstone-conglomerate Bodies in Sha 3～4 Members and Hydrocarbon Accumulation in Northern Slope of Dongying Sag

SUN Long-de

Dongying Sag is one of the most important petroleum sags in Bohai gulf petroleum province. Its northern part, immediately south to Qingtuozi, Chenjiazhuang and Binxian Uplifts is a long narrow abrupt slope named Northern Slope. This slope is located south to marginal uplift and north to generative basin/center. It is formed during the swelling of Chenjiazhuang Uplift in early Eogene. Clastic deposits of great thickness were accumulated at the slope foot during Sha 3～4 stage. From the study, the sequence stratigraphic framework of Sha 3～4 deposits in this area is composed of 3 sequence, 8 para-sequence groups and 18 para-sequences. There are 3 genetic types of sandstone-conglomerate bodies include alluvial fan, near bank subaquatic fan and fan delta. The later 2 genetic types are the major oil-bearing fans. Anticline, upward finger out, fault block, lithologic and stratigraphic traps are the 5 major trap types there.

Tarim Oil Field Company, PetroChina, Korla Xinjiang 841000

Received Date: 2002-08-23

Rev Recd Date: 2003-03-06

Publish Date: 2003-06-10

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Abstract: Dongying Sag is one of the most important petroleum sags in Bohai gulf petroleum province. Its northern part, immediately south to Qingtuozi, Chenjiazhuang and Binxian Uplifts is a long narrow abrupt slope named Northern Slope. This slope is located south to marginal uplift and north to generative basin/center. It is formed during the swelling of Chenjiazhuang Uplift in early Eogene. Clastic deposits of great thickness were accumulated at the slope foot during Sha 3～4 stage. From the study, the sequence stratigraphic framework of Sha 3～4 deposits in this area is composed of 3 sequence, 8 para-sequence groups and 18 para-sequences. There are 3 genetic types of sandstone-conglomerate bodies include alluvial fan, near bank subaquatic fan and fan delta. The later 2 genetic types are the major oil-bearing fans. Anticline, upward finger out, fault block, lithologic and stratigraphic traps are the 5 major trap types there.

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Sandstone-conglomerate Bodies in Sha 3～4 Members and Hydrocarbon Accumulation in Northern Slope of Dongying Sag

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