Oil-Gas Inclusions and Reservoir Formation in Bozhong Depression of the Bohaiwan Basin

LI Rong xi; JIN Ku li; ZHONG Wen wen; YANG Jian ye

Two types of oii-gas inciusions, the primary and the secondary, were recognized in the Tertiary ciastic rocks in Bozhong Depression of the Bohaiwan Basin in Northeastern coastai area of China. These two types of oii-gas inciusions recorded two stages of oii migration and accumuiation in the region. The secondary porosity and fractures, fiiied with abundant secondary oii-gas inciusions, are the kind of dissoiution pore formed by the eiuviation due to the upiift of the region at the end of the eariy Tertiary. Data from temperature measurements and anaiysis to compositions together with biomarkers of the oii-gas inciusions indicate that the oii trapped in secondary porosity and fractures originated from the iower Tertiary iacustrine source rocks and the oii accumuiations were controiied by the Tertiary tectonics and diagenesis. It is proposed that targets for oii expioration in the region shouid focus on the Tertiary sediments rather than the Pre-Teriary depositions. Tectonics, sedimentary discontinuity between iower and upper Tertiary and reservoir prediction are the key subjects for oii prospecting in the region.

1. Open Lab of Ore Deposits Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;

2. China University of Mining and Technology, Beijing 100083

Received Date: 2000-05-10

Rev Recd Date: 2001-02-13

Publish Date: 2001-12-10

Key words:

Abstract: Two types of oii-gas inciusions, the primary and the secondary, were recognized in the Tertiary ciastic rocks in Bozhong Depression of the Bohaiwan Basin in Northeastern coastai area of China. These two types of oii-gas inciusions recorded two stages of oii migration and accumuiation in the region. The secondary porosity and fractures, fiiied with abundant secondary oii-gas inciusions, are the kind of dissoiution pore formed by the eiuviation due to the upiift of the region at the end of the eariy Tertiary. Data from temperature measurements and anaiysis to compositions together with biomarkers of the oii-gas inciusions indicate that the oii trapped in secondary porosity and fractures originated from the iower Tertiary iacustrine source rocks and the oii accumuiations were controiied by the Tertiary tectonics and diagenesis. It is proposed that targets for oii expioration in the region shouid focus on the Tertiary sediments rather than the Pre-Teriary depositions. Tectonics, sedimentary discontinuity between iower and upper Tertiary and reservoir prediction are the key subjects for oii prospecting in the region.

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Reference (1)

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Oil-Gas Inclusions and Reservoir Formation in Bozhong Depression of the Bohaiwan Basin

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