车排子地区构造-古地貌特征及其控砂机制

doi:10.11743/ogg20080112

Abstract

Abstract:

Seismic,log,and test data as well as the backstripping technique and trend analysis method of erosion restoration,were employed in the synsedimentary palaeogeomorphology reconstruction of basal boundaries of the lowstand system tracts(LST) of the Lower Cretaceous Tugulu Group sequence,the LST of the Paleogene sequence and the lacustrine expanding system tract of the Miocene Shawan Formation sequence in the Chepaizi area,Junggar basin.The paleogeomorphologic features of these three stages and their control on glutenite in incised valley,fan deltaic glutenite and longshore sandbody were analyzed.Based on the results of these studies,this paper summarizes the controlling patterns of the geomorphology on sandbody distributions during these three stages.The LST of the Tugulu Group sequence is characterized by sand supply from the uplift,diversion of the low uplift and "ridge",transportation along the valley,and accumulation in the sag.The LST of the Paleogene sequence shares the similar features with the Tugulu Group sequence except for the insignificant feature of transportation along the valley,while the lacustrine expanding system tract of the Miocene Shawan Formation features in control of slope-break zone and low uplift zone on transportation and deposition of sand.

Key words: Junggar Basin, controlling mechanism on sandbody, palaeogeomorphology, Chepaizi area, Junggar Basin

CLC Number:

TE121.3

Xing Fengcun, Lu Yongchao, Liu Chuanhu, Xiang Kui. Structural-paleogeomorphologic features of Chepaizi area and mechanism of their control on sandbodies[J]. Oil & Gas Geology, 2008, 29(1): 78-83,106.

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Structural-paleogeomorphologic features of Chepaizi area and mechanism of their control on sandbodies

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