珠江口盆地荔湾31气田珠江组深水扇沉积相分析
- 成都理工大学“油气藏地质及开发工程”国家重点实验室 成都 610059
- 收稿日期:
1900-01-01
- 修回日期:
1900-01-01
- 刊出日期:
2011-08-10
摘要: 根据已钻井取芯段岩相分析，从荔湾31气田珠江组深水扇沉积体系中划分出巨厚层和厚层块状砂岩相、厚层正粒序砂岩相、厚层逆粒序砂岩相、平行—板状斜层理砂岩相、滑塌变形砂岩相、薄层砂岩夹层相、薄层(粉)砂岩与泥岩互层相、厚层粉砂岩相、厚层泥岩相和层状深水灰岩相等10种岩相类型和识别出砂岩相组合、泥岩相组合、(粉)砂岩与泥岩互层相组合、粉砂岩相组合和深水灰岩相组合等5种岩相组合类型，在此基础上，从珠江组深水扇沉积体系中进一步识别出内扇主水道、中扇分支水道、水道间、天然堤—溢岸、外扇和盆地等微相类型，将珠江组下部确定为以砂岩相组合为主的盆底扇内扇和斜坡扇内中扇沉积组合，其中内扇主水道和中扇分支水道是最有利储层发育的沉积微相。中、上部确定为以泥岩相组合为主的外扇和盆地沉积组合，具有随海侵扩大，深水扇最终被远洋所取代的沉积演化特征。
Facies and Depositional Model of A Deepwater Fan in the Zhujiang Formation, Liwan 31 Gasfield, Baiyun Sag, Pearl River Mouth Basin
- State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059
- Received Date:
1900-01-01
- Rev Recd Date:
1900-01-01
- Publish Date:
2011-08-10
Abstract: Based on detailed analysis of cores, logs, and seismic data, ten lithofacies were indentified, including megathick and thick massive sandstones, thick normalgraded sandstones, thick inversegraded sandstones, parallel and tabular crossstratified sandstones, slumped and deformed sandstones, thin sandstone interlayers, thin mudstonesandstone interbeds, thick siltstones, thick mudstones, and deepwater limestones. They can be organized into five lithofacies associations. These are sandstonedominated, mudstonedominated, mudstonesandstone interbed, siltstone and deepwater limestone associations. Based on the analyses of lithofacies and their associations, the depositional system of the reservoir in the Zhujiang Formation, Liwan 31 field is identified as submarine fan. Four microfacies are further recognized within the fan based on detailed analysis, including channels (including main channels in the inner fan and distributary channels in the middle fan), interchannel, leveeoverbank, outer fan and basin microfacies. Facies analysis allows to reconstruct the depositional model of the deepwater fan. During relative sealevel fall, a basinfloor fan formed as sediments from rivers or shelf margin deltas were further transported down slope and into the basin under gravity flows. During the ensuing relative sealevel rise, a slope fan was deposited as the system stepped back. The lower part of the Zhujiang Formation, mainly sandstonedominated associations, is inner fan and middleouter fan deposits of the basinfloor and the slope fan respectively. The upper part, mainly mudstonedominated associations, siltstone associations, and deepwater associations are outer fan deposits of the slope fan and basin deposits. Along with the transgression, submarine fan was finally replaced by pelagic deposits.
李云. 珠江口盆地荔湾31气田珠江组深水扇沉积相分析[J]. 沉积学报, 2011, 29(4): 665-676.
| 引用本文: |
李云. 珠江口盆地荔湾31气田珠江组深水扇沉积相分析[J]. 沉积学报, 2011, 29(4): 665-676.
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LI Yun. Facies and Depositional Model of A Deepwater Fan in the Zhujiang Formation, Liwan 31 Gasfield, Baiyun Sag, Pearl River Mouth Basin[J]. Acta Sedimentologica Sinica, 2011, 29(4): 665-676.
| Citation: |
LI Yun. Facies and Depositional Model of A Deepwater Fan in the Zhujiang Formation, Liwan 31 Gasfield, Baiyun Sag, Pearl River Mouth Basin[J]. Acta Sedimentologica Sinica, 2011, 29(4): 665-676.
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