The Consideration on the Quantitative Division of Fan Delta Subfacies

YAN Ji-hua; CHEN Shi-yue; CHENG Li-hua

The quantitative division of sedimentary subfacies is a difficult problem of sedimentology. By flume experiment, it is found that during the formation the fan delta prograde forward and accrete upward constantly. The accretion set and foreset represent respectively the fan delta plain and front subfacies. In the section, the thickness of plain becomes thinner from root to former, and the thickness of front becomes thicker. This paper puts forward that the point where the thicknesses of accretion set and foreset are equal can be regarded as the borderline of fan delta plain and front, which resolves the problem of the quantitative division of fan delta subfacies on the plane. Based on simulation experiment of fan delta in steep slope, the points where the thicknesses of accretion set and foreset are equal change with the development of fan delta, but the ratio of the plain length to the whole fan length is unchangeable, which is affected only by the gradient of original forms and fan surface. The gradient of fan surface is an experiental constant. So, in the exploration, after we get the gradients of original forms by dipmeter and the length of fan delta by seismic profile or the statistics of single-well data, we can calculate the distribution of the front, which provide foundations for the prediction of favorable facies in petroleum exploration.

College of Geo-Resources and Information, University of Petroleum,Dongying Shandong 257061

Received Date: 2003-07-02

Rev Recd Date: 2003-09-03

Publish Date: 2004-09-10

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Abstract: The quantitative division of sedimentary subfacies is a difficult problem of sedimentology. By flume experiment, it is found that during the formation the fan delta prograde forward and accrete upward constantly. The accretion set and foreset represent respectively the fan delta plain and front subfacies. In the section, the thickness of plain becomes thinner from root to former, and the thickness of front becomes thicker. This paper puts forward that the point where the thicknesses of accretion set and foreset are equal can be regarded as the borderline of fan delta plain and front, which resolves the problem of the quantitative division of fan delta subfacies on the plane. Based on simulation experiment of fan delta in steep slope, the points where the thicknesses of accretion set and foreset are equal change with the development of fan delta, but the ratio of the plain length to the whole fan length is unchangeable, which is affected only by the gradient of original forms and fan surface. The gradient of fan surface is an experiental constant. So, in the exploration, after we get the gradients of original forms by dipmeter and the length of fan delta by seismic profile or the statistics of single-well data, we can calculate the distribution of the front, which provide foundations for the prediction of favorable facies in petroleum exploration.

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Reference (15)

[1]	王寿庆.扇三角洲模式.北京:石油工业出版社,1993.87～96[Wang Shouqing. Fan-delta Model. Beijing: Petroleum Industry Press,1993.87～96]
[2]	周书欣,赖特V P,普拉特N H,等.湖泊沉积体系与油气.北京:科学出版社,1991.137[Zhou Shuxin, Wright V P, Platt N H, et al. Lacustrine depositional system and oil-gas accumulation. Beijing: Science Press,1991.137]
[3]	王良忱,张金亮.沉积环境和沉积相.北京:石油工业出版社,1996.179[Wang Liangchen, Zhang Jinliang. Sedimentary environments and Facies. Beijing: Petroleum Industry Press, 1996.179]
[4]	赵澄林.沉积学原理.北京:石油工业出版社,2001.91[Zhao Chenglin. Principles of sedimentology. Beijing: Petroleum Industry Press,2001.91]
[5]	陆克政,朱筱敏,漆家福.含油气盆地分析.山东东营:石油大学出版社,2001.225[Lu Kezheng, Zhu Xiaomin, Qi Jiafu. Analysis of petroliferous basin. Dongying Shandong: Petroleum University Press,2001.225]
[6]	赵澄林.油区岩相古地理.山东东营:石油大学出版社,2001.4[Zhao Chenglin. Lithofacies Paleogeography in Oil Field. Dongying Shandong: Petroleum University Press,2001.4]
[7]	Jun Tanaka, Wataru Maejima. Fan-delta sedimentation on the basin margin slope of the Cretaceous, strike-slip Izumi Basin, southwestern Japan.Sedimentary Geology,1995,98:205～213
[8]	Wonn Soh, Takeo Tanaka, Asahiko Taira. Geomorphology and sedimentary processes of a modern slope-type fan delta(Fujikawa fan delta),Suruga Trough, Japan.Sedimentary Geology,1995,98:79～95
[9]	赵澄林,吴崇筠.油区岩相古地理.北京:石油工业出版社,1987.238[Zhao Chenglin. Wu Chongjun. Lithofacies paleogeography in oil field. Beijing: Petroleum Industry Press,1987.238]
[10]	冯增昭.单因素分析综合作图法.沉积学报,1992,10(3):70～77[Feng Zengzhao. Single factor analysis mapping. Acta Sedimentologica Sinica,1992,10(3):70～77]
[11]	姜在兴.沉积学. 北京:石油工业出版社,2003.393～398,491～498[Jiang Zaixing. Sedimentology. Beijing: Peroleum Industry Press,2003.393～398,491～498]
[12]	孔凡仙.东营凹陷北带砂砾岩扇体勘探技术与实践.石油学报,2000,21(5):27～31[Kong Fanxian. Exploration technique and practice of sandy-conglomeratic fan in the northern part of Dongying depression. Acta Petrolei Sinica,2000,21(5):27～31]
[13]	张春生,刘忠保,施冬, 等. 扇三角洲形成过程及演变规律.沉积学报,2000,18(4):521～526[Zhang Chunsheng, Liu Zhongbao, Shi Dong, et al. Formed proceeding and evolution las of fan delta. Acta Sedimentologica Sinica,2000,18(4):521～526]
[14]	张春生,刘忠保.现代河湖沉积与模拟实验.北京:地质出版社,1997.172[Zhang Chunsheng, Liu Zhongbao. The recent fluviolacustrine deposit and simulation experiment. Beijing: Geological Publishing House,1997.172]
[15]	López-Blanco M, Marzo M, Burbank D W,et al. Tectonic and climatic controls on the development of foreland fan deltas: Montserrat and Sant Lloren? del Munt systems (Middle Eocene, Ebro Basin, NE Spain). Sedimentary Geology,2000,138:17～39

The Consideration on the Quantitative Division of Fan Delta Subfacies

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