Short-term Base-level Cycle and Genetic Analysis of Reservoirs of Delta front at Gentle Slope in Depressed-type Lacustrine Basin,Shaanxi-Gansu-Ningxia Basin

LI Feng jie; WANG Duo yun; SONG Guang shou; ZHENG Xi min; LIOU Zi liang; WANG Feng; WANG Zhi kun; LI Shu tong

By using short term base level cycle theory of high resolution sequence stratigraphy, we delicately analyzed reservoir sandstones which deposited on the delta front gentle slope zone with Chang Ⅲ oil Formation in Chenghua area, Shanxi gansu ningxia basin. On the base of genetic, reservoir sandstones may be divided into three types of sandstones that consist of six subtypes. While these sandstones genetic are evidently influenced by the short term base level up and down changes and the relation of accompanied accommodations and sediment alimentations. In the course of base level rising, ① A/S1, sandstone genetic type is mainly truncated distributary channel sandstone body. ② A/S1, sandstone genetic type is mainly integrated distributary channel sandstone body. There is recombination bar genetic sandstone body at the underwater slope break zone. With the base level up and down changes, regular change of short term base level cycle influences the distribution of different genetic sandstone bodies. And distributional model of different genetic sandstones that deposit on different locals of delta front at gentle slope in depressed type lacustrine basin is built.

1. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000;

2. Graduat School of the Chinese Academy of Sciences, Beijing 100039;

3. Second Oil Production Factory, Chang Qing Corporation, Qingyang Gansu 745100

Received Date: 2003-03-28

Rev Recd Date: 2003-08-25

Publish Date: 2004-03-10

Key words:

short term base level cycle /
sandstone reservoirs /
genetic /
analysi /
delta front /
Yanchang Formation Shaanxi Gansu Ningxia basin

Abstract: By using short term base level cycle theory of high resolution sequence stratigraphy, we delicately analyzed reservoir sandstones which deposited on the delta front gentle slope zone with Chang Ⅲ oil Formation in Chenghua area, Shanxi gansu ningxia basin. On the base of genetic, reservoir sandstones may be divided into three types of sandstones that consist of six subtypes. While these sandstones genetic are evidently influenced by the short term base level up and down changes and the relation of accompanied accommodations and sediment alimentations. In the course of base level rising, ① A/S1, sandstone genetic type is mainly truncated distributary channel sandstone body. ② A/S1, sandstone genetic type is mainly integrated distributary channel sandstone body. There is recombination bar genetic sandstone body at the underwater slope break zone. With the base level up and down changes, regular change of short term base level cycle influences the distribution of different genetic sandstone bodies. And distributional model of different genetic sandstones that deposit on different locals of delta front at gentle slope in depressed type lacustrine basin is built.

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Reference (12)

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Short-term Base-level Cycle and Genetic Analysis of Reservoirs of Delta front at Gentle Slope in Depressed-type Lacustrine Basin,Shaanxi-Gansu-Ningxia Basin

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