The YS1 area in Sichuan basin has undergone multiple stages of tectonic evolution.The faults are characterized by multiple stages and multiple strikes,and serious mud losses occurred in the drilled well.It is difficult to finely characterize fracture and analyze structural development when the conventional seismic interpretation method is used.In this study,according to the actual situation,ant tracking technology was used to predict fractures,whose accuracy was improved by noise reduction,continuity enhancement,fault boundaries height,and fake structures elimination.The process is as follows:firstly,the input seismic data volume is pre-processed by structure-oriented filtering and discontinuity detection,then the ant tracking parameter settings are optimized,and finally the ant tracking under the occurrence control is performed.The data can not only be used to assist fault interpretation but also provide a data basis for subsequent fault development analysis and horizontal well location deployment.
Dong M C, Lyu H T, Pu R H, et al. Characteristics of strike-slip fault and its hydrocarbon geological significance in the eastern of central Tarism Basin[J]. Geophysical Prospecting for Petroleum, 2016, 55(6):840-850.
Liu Z F, Qu S L, Sun J G, et al. Progress of seismic fracture characterization technology[J]. Geophysical Prospecting for Petroleum, 2012, 51(2):191-198.
Shi X W, Tong Y M, Liu W P, et al. Analysis of seismic-scale fracture system of shale reservoir and its petroleum significance:A case study of well Ning 201 area of Changning Block, Sichuan Basin[J]. Marine Origin Petroleum Geology, 2019, 24(4):87-96.
Zhou W, Yin T J, Zhang Y C, et al. Application of ant tracking technology to fracture prediction:A case study from Xiagou Formation in Qingxi Oilfield[J]. Northwest Oil & Gas Exploration, 2015, 27(6):111-118.
Wang J, Li Y D, Gan L D. Fracture characterization based on azimuthal anisotropy of ant-tracking attribute volumes[J]. Oil Geophysical Prospecting, 2013, 48(5):763-769.
[9]
Sait B, Matthew J P. Fault and fracture distribution within a tight-gas sandstone reservoir:Mesaverde Group,Mamm Creek Field,Piceance Basin,Colorado,USA[J]. Petroleum Geoscience, 2013, 19(8):203-222.
doi: 10.1144/petgeo2011-093
[10]
Andreas W, Mohamed S S. Integration of surface/subsurface techniques reveals faults in Gulf of Suez oilfields[J]. Petroleum Geoscience, 2011, 17(5):165-179.
doi: 10.1144/1354-079310-014
Sun L, Wang Z Z, Li H L, et al. Application of fault tracking technology based on ant colony algorithm in Wuxia Area[J]. Fault-Block Oil & Gas Field, 2014, 21(6):716-721.
Li N, Wang L Y, Huang S B, et al. 3D seismic fine structural interpretation in complex fault zones based on the high-definition ant-tracking attribute volume[J]. Oil Geophysical Prospecting, 2019, 54(1):182-190.
Sun S S, Rui Y, Dong D Z, et al. Paleogeographic evolution of the late Ordovician-early Silurian in upper and middle Yangtze regions and depositional model of shale[J]. Oil & Gas Geology, 2018, 39(6):1087-1106.
Zheng H, Cai J X, Wang J B. Gaussian beam tomography with structure-filtering and its applications[J]. Geophysical and Geochemical Exploration, 2020, 44(2):372-380.
Zhao M Z, Fan X H, Liu C F, et al. Complex fault-block traps identification with structure-oriented filter[J]. Oil Geophysical Prospecting, 2011, 46(s1):128-133.
[16]
Fehmers G C, Hocker C F W. Fast Structural interpretation with structure-oriented filtering[J]. Geophysices, 2003, 68(4):1286-1293.
Li P P, Zhao R M, Yang S L, et al. The application structural curvature and amplitude curvature attribute to seismic interpretation[J]. Geophysical and Geochemical Exploration, 2013, 37(5):916-920.
Zhang Y H, Zhang Y, Du W, et al. Application of chaos attributes to predict the small-scale glutenite bodies in the steep-slope zone of Biyang depression[J]. Special Oil & Gas Reservoirs, 2016, 23(3):11-15.
Lu M Y, Tang Z Y, Zhang Y J. Application of ant tracking technology in X block of Plutonio oilfield[J]. Science Technology and Engineering, 2020, 20(8):2992-2996.