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LIU Zhao-jun. Lacus Subaqueous Fan Sedimentary Characteristics and Influence Factors——A Case Study of Shuangyang Formation in Moliqing Fault Subsidence of Yitong Basin[J]. Acta Sedimentologica Sinica, 2003, 21(1): 148-154.
Citation: LIU Zhao-jun. Lacus Subaqueous Fan Sedimentary Characteristics and Influence Factors——A Case Study of Shuangyang Formation in Moliqing Fault Subsidence of Yitong Basin[J]. Acta Sedimentologica Sinica, 2003, 21(1): 148-154.

Lacus Subaqueous Fan Sedimentary Characteristics and Influence Factors——A Case Study of Shuangyang Formation in Moliqing Fault Subsidence of Yitong Basin

  • Received Date: 2002-12-26
  • Rev Recd Date: 2003-01-10
  • Publish Date: 2003-03-10
  • It is typically developed lacus subaqueous fan of Shuangyang Formation in Moliqing fault subsidence of Yitong Basin in Eocene. According to core, well-logging and seismic data, associated with grading analysis and other methods, lacus subaqueous fan is divided into inner fan, middle fan and out fan. From bottom to top a integrated prograding lacus subaqueous fan is consisted of out fan, middle fan and inner fan subfacies in vertical , and it has the features that show thicker, coarser towards up. Inner fan can be further separated into channel, channel levee and slump deposits, middle fan is classified into braided channel, braided interchannel and suppafan lobes, and out fan is consisted of classic turbidites and lacustrine mudstone. Subaqueous fan is mainly formed at the side of steep slope controlled by contemporary fault, and some formed at the front of fan-delta. Primary factors which influence the distribution and emergence of subaqueous fan is that movements of contemporary fault bring steep landform, episode movements of which make up of the burst mechanics of subaqueous gravity flow forming. Subaqueous fan of steep slope mainly occurs at the zone of steep slope, stable subaqueous fan mostly emerges at the front of fan-delta, meanwhile climate is a favorable factor for stable subquous fan. Base-level affects the features of facies orders. It is easily formed prograding subaqueous fan in lowstand systems tracts and regressive systems tracts, there develop regressive subaqueous fan in the transgressive systems tracts as well. The precondition that preserves subaqueous fan is the backwater environment of deeper or deep lacus. The results of statistics show that all that bear industrial petroleum and gas mostly concentrated in the middle fan, and of which is much rich in the braided channel.
  • [1] [1]Gorsline D S, Emery K O. Turbidity current deposits in San Pedro and Santa Monica basins of southern California[J]. Geol Soc America Bull, 195 9, 70:279~290

    [2]Sullwold H H, Jr. Tarzana fan-deep submarine fan of late Miocene age, Los Angeles County, California[J]. AAPG Bull, 1960,44:433~457

    [3]Jacka A D, et al. Permian deep-sea fans of the Delaware mountain gr oup (Guadalupian), Delaware basin[J]. Soc Econ Paleontol Mineral Permian, Basi n Section Publ, 1968, 68~11: 49~90

    [4]Walker R G. Deep-water sandstone facies and ancient submarine fans: Mo dels for exploration for stratigraphic traps[J]. AAPG Bull,1978, 62:932~966

    [5]Bauma A H, Normark W R, Barnes N E. Submarine fans and related turbidit e systems[M]. New York: Springer-Verlag, 1985. 351

    [6]Shanmugam G, Moiola R G. Submarine fans: characteristics, models, class ification, and reservoir potential[J]. Earth Sciences Review,1988,24:383~428

    [7]刘招君,王东坡,何起祥. 攀西地区上三叠统湖泊浊积岩沉积特征及其地质意义 [A]. 见:张云湘主编. 中国攀西裂谷文集[C]. 北京:地质出版社,1985.298~306[Li u Zhaojun, Wang Dongpo, He Qixiang. Sedimentary Character and Geological Signifi cance of Upper Triassic Lake Facies Turbidite in Panxi Area[A].In:Zhang Yunxia ng, ed. Contribution to Panxi Rift China[C].Beijing: Geological Publishing Hou se,1985.198~306]

    [8]吴崇筠,李纯菊,等. 断陷盆地中的浊积岩[A]. 见:中国石油学会石油地质委员会主编. 碎屑岩沉积相研究[C].北京:石油工业出版社,1988. 1~17[Wu Chongyun, L i Chunju, et al. Turbidite in faulted subdidence-lake basin[A]. In:Petrol eum Geology Institute of Chinese Petroleum Society, ed. Study of Clastic Sedim entary Facies[C].Beijing: Petroleum Industry Press,1988.1~17]

    [9]丘东洲,何治亮. 陆盆扇体沉积的形成机制及其油气意义[A]. 见:中国石油学会石油地质委员会主编. 碎屑岩沉积相研究[C].北京:石油工业出版社,1988.148~154[ Qiu Dongzhou,He Zhiliang.Oil and Gas Reservoir in Continental Basin[A]. In:Pet roleum Geology Institute of Chinese Petroleum Society, ed. Study of Clastic S edimentary Facies[C]. Beijing: Petroleum Industry Press,1988.148~154]

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    [11]Posamentier H W and Vail P R. Eustatic controls on clastic deposition Ⅱ-Se quence and systems tract models[A]. In: Wilgus C K, et al, eds. Sea-level changes: an inlegrated approach[C]. SEPM Special Publication, 1988, 42:125~15 4

    [12]刘招君,董清水,王嗣敏等. 陆相层序地层学导论与应用[M]. 北京:石油工业出版社,2002[Liu Zhaojun, Dong Qingshui, Wang Siming, et al. Introduction to Cont inental Sequence Stratigraphy & Application[M]. Beijing: Petroleum Industry P ress, 2002]

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  • Received:  2002-12-26
  • Revised:  2003-01-10
  • Published:  2003-03-10

Lacus Subaqueous Fan Sedimentary Characteristics and Influence Factors——A Case Study of Shuangyang Formation in Moliqing Fault Subsidence of Yitong Basin

Abstract: It is typically developed lacus subaqueous fan of Shuangyang Formation in Moliqing fault subsidence of Yitong Basin in Eocene. According to core, well-logging and seismic data, associated with grading analysis and other methods, lacus subaqueous fan is divided into inner fan, middle fan and out fan. From bottom to top a integrated prograding lacus subaqueous fan is consisted of out fan, middle fan and inner fan subfacies in vertical , and it has the features that show thicker, coarser towards up. Inner fan can be further separated into channel, channel levee and slump deposits, middle fan is classified into braided channel, braided interchannel and suppafan lobes, and out fan is consisted of classic turbidites and lacustrine mudstone. Subaqueous fan is mainly formed at the side of steep slope controlled by contemporary fault, and some formed at the front of fan-delta. Primary factors which influence the distribution and emergence of subaqueous fan is that movements of contemporary fault bring steep landform, episode movements of which make up of the burst mechanics of subaqueous gravity flow forming. Subaqueous fan of steep slope mainly occurs at the zone of steep slope, stable subaqueous fan mostly emerges at the front of fan-delta, meanwhile climate is a favorable factor for stable subquous fan. Base-level affects the features of facies orders. It is easily formed prograding subaqueous fan in lowstand systems tracts and regressive systems tracts, there develop regressive subaqueous fan in the transgressive systems tracts as well. The precondition that preserves subaqueous fan is the backwater environment of deeper or deep lacus. The results of statistics show that all that bear industrial petroleum and gas mostly concentrated in the middle fan, and of which is much rich in the braided channel.

LIU Zhao-jun. Lacus Subaqueous Fan Sedimentary Characteristics and Influence Factors——A Case Study of Shuangyang Formation in Moliqing Fault Subsidence of Yitong Basin[J]. Acta Sedimentologica Sinica, 2003, 21(1): 148-154.
Citation: LIU Zhao-jun. Lacus Subaqueous Fan Sedimentary Characteristics and Influence Factors——A Case Study of Shuangyang Formation in Moliqing Fault Subsidence of Yitong Basin[J]. Acta Sedimentologica Sinica, 2003, 21(1): 148-154.
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