The Architecture and Distribution of the Upper Triassic Reservoir of the Northern Chuxiong Basin

LAI Sheng-hua; SUN Lai-xi; ZHAO Xia-fei

The Triassic reservoir sandstone was from the basin-floor fan to the coastal bar and the delta, and can be divided into eight third-order sequences in the Chuxiong basin during late Triassic. This paper, using depositional sequence stratigraphy and high-resolution sequence stratigraphy, using extended Simpon math, extended Simpon 3 /8 math and Trapezoidalmath, has studied the reservoir architecture and spatial distribution through measured sections.The reservoir-body of upper Triassic, showing successive thin from lower to upper, was sandstone and conglomerate.The southern and northern fan-bodies of the Pujiacun formation ( T₃ p) thatwas 7162 km³ had not become connection.Although the northern sandstone and conglomerate hasworse connection, shorter extension and more extensive heterogeneity, the southern channel sandstone bodies have been larger and better connection. The sandstone and conglomerate of the Ganhaizi formation ( T₃ s), which was 4175 km³, was oval distribution, more barrier layers and extensive heterogeneity in the north, and was circling distribution, weaker maro-heterogeneity in the south. The circling sand-stone body of the Shezi Formation ( T₃ s) was 5036 km³, in which the connection of the lake sandstone bodywasworse than that of the channel sandstone body and the latterwas been characterized by more homogeneous

The Architecture and Distribution of the Upper Triassic Reservoir of the Northern Chuxiong Basin

1. State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Petroleum Institute of Southwest, Nanchong Sichuan 637001;

2. Chengdu University of Technology, Chengdu 610059

Received Date: 2004-02-17

Rev Recd Date: 2004-09-08

Publish Date: 2005-06-10

Key words:

Abstract: The Triassic reservoir sandstone was from the basin-floor fan to the coastal bar and the delta, and can be divided into eight third-order sequences in the Chuxiong basin during late Triassic. This paper, using depositional sequence stratigraphy and high-resolution sequence stratigraphy, using extended Simpon math, extended Simpon 3 /8 math and Trapezoidalmath, has studied the reservoir architecture and spatial distribution through measured sections.The reservoir-body of upper Triassic, showing successive thin from lower to upper, was sandstone and conglomerate.The southern and northern fan-bodies of the Pujiacun formation ( T₃ p) thatwas 7162 km³ had not become connection.Although the northern sandstone and conglomerate hasworse connection, shorter extension and more extensive heterogeneity, the southern channel sandstone bodies have been larger and better connection. The sandstone and conglomerate of the Ganhaizi formation ( T₃ s), which was 4175 km³, was oval distribution, more barrier layers and extensive heterogeneity in the north, and was circling distribution, weaker maro-heterogeneity in the south. The circling sand-stone body of the Shezi Formation ( T₃ s) was 5036 km³, in which the connection of the lake sandstone bodywasworse than that of the channel sandstone body and the latterwas been characterized by more homogeneous

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The Architecture and Distribution of the Upper Triassic Reservoir of the Northern Chuxiong Basin

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