Coarse-grained Lacustrine Slope Apron Deposits in Shaobo Area, Gaoyou Sag, Southern China
Journal of Energy and Natural Resources
Volume 9, Issue 1, March 2020, Pages: 44-50
Received: Feb. 18, 2020;
Accepted: Mar. 16, 2020;
Published: Apr. 1, 2020
Views 94 Downloads 22
Zhou Yigang, College of Petroleum Engineering, Liaoning Shihua University, Fushun, China
Li Cunlei, College of Petroleum Engineering, Liaoning Shihua University, Fushun, China
Yan Yunbiao, College of Petroleum Engineering, Liaoning Shihua University, Fushun, China
Chen Panpan, College of Petroleum Engineering, Liaoning Shihua University, Fushun, China
The Dainan formation reservoirs in Shaobo area, Gaoyou sag, Southern China, sedimented mass conglomerates dominated by lacustrine slope apron system which fended by multiple flood channels with massive terrigenous clasts. In the early days, offshore fan-shaped sediments in the Shaobo area of the Gaoyou Sag were considered to be the main sedimentary system. However, a new lacustrine sedimentary model is presented in this paper. By careful core description and interpretation, four facies unions are recognized: (1) Facies union 1: Downslope clastic pathways that composed of massive conglomerates up to 6-25m thick, alternating with brown-dark gray mudstone and the etching structures can be often observed; (2) Facies union 2: Debris-flow Lobe is composed of massive conglomarates, matrix-supported to clast-supported polymictic conglomerates up to 10-50m thick; (3) Facies union 3: Underwater distributary channel is composed of trough cross-stratified sandstone, horizontally stratified sandstone and ripple cross-stratified fine to medium-grained sandstone, up to 5-20m thick; (4) Facies union 4: mudstone is dominates by thick grey black mudstone interbeding thin sandstone, the etching features are rare and bedding is typically parallel. In our study area, the traction current deposits constitute the producing petroleum reservoirs, and the conglomerates deposits are poor reservoirs. The sedimentary model may be applicable to other fault depression for predicting reservoir distribution.
Coarse-grained Lacustrine Slope Apron Deposits in Shaobo Area, Gaoyou Sag, Southern China, Journal of Energy and Natural Resources.
Vol. 9, No. 1,
2020, pp. 44-50.
Chen Y. Z, Ning S. H, Li J. W, Z D. L, Y S. Analysis of sedimentary facies and sedimentary evolution of Dainan Formation in Yonglian area, Gaoyou Sag, Subei Basin [J]. Energy and Environmental Protection, 2017, 39 (07): 102-108 (In Chinese).
Dorrik A. V., Stow, Upper Jurassic Overlapping –fan Slope-apron system: Brae oil field, North Sea. Geo-marine Letters, 1983, 3, 217-222.
Russell B. W., Douglas G. M., Dorrik A. S., Phillip P. W., The nouthwest african slope apron: a modern analogue for deepwater systems with complex seafloor topography. Marine and petroleum geology, 2000, 17, 253-265.
Xia L. J., Wu X. Y., Mao S. L., Zhang S. F., Seismic prediction of nearshore subaqueous fan in Shaobo area, Gaoyou sag. Progress In Exploration Geophysics, 2008, 31 (3): 212-218 (in Chinese).
Yi W., Wang W. F., Xin Y., Study on the sedimentary evolution of Dainan Formation in south of the deep depression area in Gaoyou sag. Small Hydrocarbon Reservoirs, 2010, 3 (2): 13-16 (in Chinese).
Jiang Z. Q. Study on sequence stratigraphic division and sandstone reservoir prediction in Subei Basin [J]. Shanghai Land and Resources, 2016, 37 (03): 71-74 (in Chinese).
Li C. L., Liu T., Xia L. J., Sedimentary characteristics of dereliction fan delta in the second member of Dainan Formation, Huangjue Area, Gaoyou sag, Journal of Ocean University of China, 2010, 40 (4): 65-72 (in Chinese).
Mao F. M., Zhang J. L., Xu Z. L., Hydrocarbon Generation and geochemistry in Gaoyou sag. Beijing Petroleum Industry Press, Beojing: 2002.
Pang J. M., Cao B., Origin and Exploration Practice of E2d Concealed Oil and Gas Accumulation in Gaoyou sag. Offshore oil, 2005, 5 (3): 7-13 (In Chinese).
Ineson J. R., Coarse-grained subaqueous fan and slope apron deposits in a Cretaceous back-arc basin, Antarctica. Sedimentology, 1989. 36, 793–819.
Li W. J, Z C, Y S. f, W T. Study on the starting velocity of fine particles in the Three Gorges Reservoir [J]. Journal of Chongqing Jiaotong University (Natural Science Edition), 2016, 35 (06): 68-72 (In Chinese).
Charlet F., Fagel N., Hauregard F., Minnebo B., Meischner D., Team S. O. N. I. C., Sedimentary dynamics on isolated highs in Lake Baikal: evidence from detailed high-resolution geophysical data and sediment cores. Global and planetary change, 2005, 46, 125-141.
František Tet'ák, Daniel Pivko, Martin Kováčik. Depositional systems and paleogeography of Upper Cretaceous- Paleogene deep-sea flysch deposits of the Magura Basin (Western Carpathians) [J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 2019, 533.
Henry W. Posamentier, Venkatarathnam Kolla, L H. Q. A Summary of Deep Water Turbulent Sedimentation [J]. Acta Sedimentologica Sinica, 2019, 37 (05): 879-903.
Marianna Soler, Jordi Colomer, Andrew Folkard, Teresa Serra. Particle size segregation of turbidity current deposits in vegetated canopies [J]. Science of the Total Environment, 2020, 703.
Wang Y. Y, Z Q. D, H W. L, Z R. Y. Study on the formation mechanism of sieve layer and coarsening layer in the stacked bedding structure of high concentration viscous debris flow [J]. Acta Sedimentologica Sinica, 2003 (02): 205- 210 (In Chinese).
Shunli Li, Xiaomin Zhu, Shengli Li, Chenglin Gong, Rong Pan, Hehe Chen. Trigger mechanisms of gravity flow deposits in the Lower Cretaceous lacustrine rift basin of Lingshan Island, Eastern China [J]. Cretaceous Research, 2020, 107.
Li C. L., Ren W. W., Tang M. M., Preliminary study on gravity flow depositional system based on fluid properties conversion theory. geological review, 2012, 58, 285-296 (In Chinese).
Lin Y. Z., Zhang J. L., Progress of continental reservoir sedimentology. Beijing: Petroleum Industry Press, 1996 (In Chinese).
Zhang J. L., Xie J., Reservoir facies models. Petroleum Industry Press, Beijing, 2008 (In Chinese).
Boggs J. S., Principles of Sedimentology and Stratigraphy. Prentice Hall, USA, 1995, 395-406.