Sequence Analysis and Source-Reservoir-Cap Rock Associations of Nadu Formation in Baise Basin

PENG Jun; ZHENG Rong-cai; CHEN Jing-shan

Through the comprehensive analysis of out crop, rock cores, well loggings and seismic data, one super-long-term, five long-term and sixteen middle-term base-level cycle sequences are distinguished in Nadu Formation of Baise basin. In this paper, the relationship between the source-reservoir-cap associations and the base-level cycle sequences of Nadu Formation are discussed in detail, and some knowledge is acquired as follows: (1) long-term base-level cycles bear close relation to source-reservoir-cap rock associtations,the main reservoir sand bodies develop in the early-middle stage of the uprising periods and middle-late stage of subsiding periods of the long-term base-level cycle, and the main hydrocarbon source rocks and favourable regional cap rocks develop at the turning position from uprising to subsiding of the long-term base-level cylce; (2) the characteristics of source-reservoir-cap rock associations developed in each long-term base-level cycle are distinctly different and controlled by the frequency, amplitude of the rising and falling of the base-level, facies association, accommodation and A/S ratio; (3) according to the spatial relationship of source rocks, reservoir rocks and cap rocks in the vertical or horizontal section of the formation, three types of basic associations can be divided. The first associations is usually of the type with source rocks in the upper and reservoirs below, the second one with source rocks below and reservoirs in the upper, and the third one with source rocks in other district.

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

2 State Key Laboratory of oil and gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 6l0059

Received Date: 2001-07-04

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Abstract: Through the comprehensive analysis of out crop, rock cores, well loggings and seismic data, one super-long-term, five long-term and sixteen middle-term base-level cycle sequences are distinguished in Nadu Formation of Baise basin. In this paper, the relationship between the source-reservoir-cap associations and the base-level cycle sequences of Nadu Formation are discussed in detail, and some knowledge is acquired as follows: (1) long-term base-level cycles bear close relation to source-reservoir-cap rock associtations,the main reservoir sand bodies develop in the early-middle stage of the uprising periods and middle-late stage of subsiding periods of the long-term base-level cycle, and the main hydrocarbon source rocks and favourable regional cap rocks develop at the turning position from uprising to subsiding of the long-term base-level cylce; (2) the characteristics of source-reservoir-cap rock associations developed in each long-term base-level cycle are distinctly different and controlled by the frequency, amplitude of the rising and falling of the base-level, facies association, accommodation and A/S ratio; (3) according to the spatial relationship of source rocks, reservoir rocks and cap rocks in the vertical or horizontal section of the formation, three types of basic associations can be divided. The first associations is usually of the type with source rocks in the upper and reservoirs below, the second one with source rocks below and reservoirs in the upper, and the third one with source rocks in other district.

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Reference (7)

[1]	Cross T A,Lessenger M A.Sediment Volume Partitioning:Rationale for Stratigraphic Model Evaluation and High-Resolution Stratigraphic Correlation[R].Accepted for Publication in Norwegian Petroleums-Forening Conference Volume,July.1996,1～24
[2]	邓宏文,王洪亮.层序地层基准面的识别、对比技术及应用[J].石油与天然气地质,1996,17(3):177～184
[3]	王洪亮,邓宏文.地层基准面原理在湖相储层预测中的应用[J].石油与天然气地质,1997,18(2):96～102
[4]	郑荣才.四川盆地下侏罗统大安寨段高分辨率层序地层学[J].沉积学报,1998,16(2):42～49
[5]	郑荣才,吴朝容.西部凹陷深层沙河街组生储盖组合的层序分析[J].成都理工学院学报,1999,26(4):348～356
[6]	吴朝容,郑荣才.辽河油田西部洼陷沙河街组高分辨率层序地层学特征[J].成都理工学院学报,1999,26(4):375～381
[7]	柳梅青,陈亦军,郑荣才.川西新场气田蓬莱镇组陆相地层高分辨率层序地层学研究[J].沉积学报,2000,18(1):50～56

[1]	Cross T A,Lessenger M A.Sediment Volume Partitioning:Rationale for Stratigraphic Model Evaluation and High-Resolution Stratigraphic Correlation[R].Accepted for Publication in Norwegian Petroleums-Forening Conference Volume,July.1996,1～24
[2]	邓宏文,王洪亮.层序地层基准面的识别、对比技术及应用[J].石油与天然气地质,1996,17(3):177～184
[3]	王洪亮,邓宏文.地层基准面原理在湖相储层预测中的应用[J].石油与天然气地质,1997,18(2):96～102
[4]	郑荣才.四川盆地下侏罗统大安寨段高分辨率层序地层学[J].沉积学报,1998,16(2):42～49
[5]	郑荣才,吴朝容.西部凹陷深层沙河街组生储盖组合的层序分析[J].成都理工学院学报,1999,26(4):348～356
[6]	吴朝容,郑荣才.辽河油田西部洼陷沙河街组高分辨率层序地层学特征[J].成都理工学院学报,1999,26(4):375～381
[7]	柳梅青,陈亦军,郑荣才.川西新场气田蓬莱镇组陆相地层高分辨率层序地层学研究[J].沉积学报,2000,18(1):50～56

Sequence Analysis and Source-Reservoir-Cap Rock Associations of Nadu Formation in Baise Basin

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