Two types of strike-slip and transtensional intrabasinal structures controlling sandbodies in Yitong Graben

Abstract

Recently, the researches on structure controls on sandbodies have provided a new method for predicting petroleum reservoirs. The Yitong (伊通) graben is situated in the northern section of the Tan-Lu (郯-庐) fault system in eastern China. It was characterized by dual properties of strike-slip and extension in Cenozoic. Two types of intrabasinal structures were identified as oblique fault and transverse uplift in the graben. The oblique faults arranged en echelon in plain and locally presented negative rosette structures on seismic profile, so they were closely derived from strike-slip movement of the northwestern boundary faults. Moreover, these oblique faults were divided to five zones. The three transverse uplifts, located corresponding to flattened southeast boundary faults, were mainly originated by displacement-gradient folding due to segmental extensional activities of southeast boundary faults. The large-scale sandbodies of subaqueous fan facies and fan delta facies had developed at the two types of intrabasinal structure zone. Based on analyzing the seismic facies, logging facies and seismic attribute extractions, and on discovering many incised valleys at the oblique fault zones, the two types of intrabasinal structures were revealed to have conducted drainage entering basin and further dispersing, and to have consequently controlled the development and distribution of sandbodies.

Keywords

Yitong graben / transtensional structure / oblique fault / accommodation zone

References

[1] Chen F. J., Jia Q. S., Zhang H. N.. Transfer Zone and Its Relation with Distribution of Sand Bodies. Oil & Gas Geology, 2004, 25(2): 144-148.

[2] Du X. D., Lu K. Z., Qi J. F., . Styles and Origin of Folds in Huanghua Depression. Journal of the University of Petroleum, China, 1999, 23(1): 1-5.

[3] Faulds, J. E., Ceissman, J. W., Mawer, C. K., 1990. Structural Development of a Major Extensional Accommodation Zone in the Basin and Range Province, Northwestern Arizona and Southern Navada: Implications for Kinematic Models of Continental Extension. In: Wernicke, B. P., ed., Basin and Range Extensional Tectonics near the Latitude of Las Vegas. Geological Society of America Memoir, Navada, 176: 37–76

[4] Faulds, J. E., Varga, R. J., 1998. The Role of Accommodation Zones and Transfer Zones in the Regional Segmentation of Extended Terranes. In: Faulds, J. E., Stewart, J. H., eds., Accommodation Zones and Transfer Zones: The Regional Segmentation of the Basin and Range Province. GSA Special Paper, 323: 1–45

[5] Gawthorpe R. L., Hurst J. M.. Transfer Zones in Extensional Basins: The Structural Style and Influence on Drainage Development and Stratigraphy. Journal of the Geological Society, 1993, 150: 1137-1152.

[6] Morley C. K., Nelson R. A., Patton T. L., . Transer Zones in the East African Rift System and Their Relevance to Hydrocarbon Exploration in Rifts. AAPG Bulletin, 1990, 74: 1234-1253.

[7] Moustafa A. R.. Controls on the Geometry of Transfer Zones in the Suez Rift and Northwest Red Sea: Implications for the Structural Geometry of Rift Systems. AAPG Bulletin, 2002, 86: 979-1002.

[8] Rahe B., Ferrill D. A., Morris A. P.. Physical Analog Modeling of Pull-Apart Basin Evolution. Tectonophysics, 1998, 285(1–2): 21-40.

[9] Ravnas R., Steel R. J.. Architecture of Marine Rift-Basin Successions. AAPG Bulletin, 1998, 82(1): 110-146.

[10] Ren J. Y., Lu Y. C., Li S. T., . The Tectonic Evolution of Yishu Graben and Its Depositional Filling Response. Scientia Geologica Sinica, 1999, 34(2): 196-203.

[11] Schlische R. W.. Geometry and Origin of Fault-Related Folds in Extensional Settings. AAPG Bulletin, 1995, 79(11): 1661-1678.

[12] Scott D. L., Rosendahl B. R.. North Viking Graben: An East African Prospective. AAPG Bulletin, 1989, 73: 155-165.

[13] Sun L. P., Liu Z. J., Li B. C., . Submarine Fans: Characteristics of Rock Facies and Mechanisms of Deposition. World Geology, 2001, 20(3): 249-256.

[14] Sun X. Y., Ren J. Y.. Transfer Zone and Its Relative Reservoir Distribution in Northern Zone of Dongying Sag. Petroleum Exploration and Development, 2004, 31(1): 21-23.

[15] Tong H. M.. The Property and Evolution of Boundary Faults of Yitong Graben. Journal of Geomechanics, 2002, 8(1): 35-42.

[16] Tong H. M., Mi R. S., Yu T. C., . The Strike-Slip Tectonics in the Western Liaohe Depression, Bohai Bay Basin. Acta Geologica Sinica, 2008, 82(8): 1017-1026.

[17] Wang J. H., Wang H., Xiao D. Q., . Control of Transfer Zone on Sandbodies in the Extensional Structure System: A New Approach to Reservoir Prediction. Oil & Gas Geology, 2008, 29(1): 19-25.

[18] Wang X. W.. Extensional Folding and Its Significance for Oil-Gas Exploration. Geoscience, 2008, 22(1): 60-69.

[19] Yang M. H., Zhou X. H., Wei G., . Segment, Linkage, and Extensional Fault-Related Fold in Western Liaodong Bay Subbasin, North-Eastern Bohai Sea, China. Journal of China University of Geosciences, 2008, 19(6): 602-610.

[20] Zhou J. S., Yang C. Y., Chen F. J., . Structural Characteristics and Origin of Transverse Transfer Zone in Huanghua Subbasin. Geoscience, 1997, 11(4): 425-433.

[21] Zhu Q. Z., Li C. H., Yang H. Y.. The Origin and Hydrocarbon Accumulation of Daxing Conglomerate Body in Langgu Sag. Petroleum Exploration and Development, 2003, 30(4): 34-36.