2011, 30(4) 641-647 DOI:     ISSN: 1004-5589 CN: 22-1111/P
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Keywords
Tongbomiao Fornation
seismic reflection characteristics
sequence stratigraphy
systems tract
seismic facies
Tanan Sag
Mongolia
Authors
YAO Shu-Qing-1
LIU Zhao-Jun-1
2
CHEN Yong-Cheng-3
JIA Jian-Liang-1
HAN Jiao-Yan-3
MIAO Chang-Cheng-1
PubMed
Article by Yao, S. Q. 1
Article by Liu, Z. J. 1
Article by 2
Article by Chen, Y. C. 3
Article by Jia, J. L. 1
Article by Han, J. Y. 3
Article by Miao, C. C. 1

Seismic reflection characteristics of Lower Cretaceous Tongbomiao Formation in Tanan Sag��Mongolia

YAO Shu-Qing-1, LIU Zhao-Jun-1, 2, CHEN Yong-Cheng-3, JIA Jian-Liang-1, HAN Jiao-Yan-3, MIAO Chang-Cheng-1

1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Oil-shale Laboratory Center��Jilin University��Changchun 130061��China; 3. Exploration and Development Research Institute��Northeast Oil and Gas Branch��SinoPEC��Changchun 130062��China

Abstract��

Tongbomiao Formation is an important horizon bearing oil and gas in Tanan Sag�� Studying thoroughly its sequence stratigraphy is beneficial for further exploration of the reservoir�� Using the seismic reflection characteristics combined with single well data��the sequence interfaces are recognized��and the seismic reflection characteristics of the internal system traces are studied for the first time�� The top and bottom interfaces of Tongbomiao Formation ( T3��T5) are regional unconformities and characterized by high angular unconformity with the " upside onlap and below denudation" reflection in feature�� The Tongbomiao Formation can be divided into two sequences in third order ( SQ1��SQ2) by T3--1��which is a local unconformity with the onlop reflection�� In the eastern sub-sag��system tracts are fully developed in the upper sequence ( SQ2) ��and can be divided into LST��TST�� HST and RST respectively by the first onlap interface��the last onlap interface and the downlap interface�� Based on the fact��the internal reflection structures of Tongbomiao Formation have been analyzed�� There mainly exist 5 kinds of reflection structures��named disorder-��foreset-��wedge-shaped-��parallel and sub-parallel or wavy-shaped reflections�� Among them��the first three reflections mainly appear on the front of mountains��representing the fan delta sediments��the sub-parallel or wavy-shaped reflection representing the shallow lake or fan delta plain sediments�� and the parallel reflection represents the semi-deep lake or deep lake sediments��

Keywords�� Tongbomiao Fornation   seismic reflection characteristics   sequence stratigraphy   systems tract   seismic facies   Tanan Sag   Mongolia  
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