Characteristics of Maze Karst Cave System in Lianglitage Formation of Tahe Oilfield, Tarim Basin

doi:10.7657/XJPG20240503

Abstract

Abstract:

To understand the styles and structures of the maze karst cave system in the Upper Ordovician Lianglitage formation in the Tahe oilfield, Tarim basin, the palaeohydrological and geomorphological restoration, karst framework construction, karst cave identification, and genetic model analysis were performed for Block 11 of the oilfield by using the methods such as paleolandform restoration, paleo-water system characterization, log-based stratigraphic correlation, structural fracture analysis, and seismic attribute characterization. The results show that during the Episode Ⅱ of the Middle Caledonian, the southern Tahe oilfield was higher in the northwest than in the southeast geomorphically, with developed NNW-SSE dendritic incised valleys. A subhorizontal maze karst cave system with closed conduit structures and high intensity of erosion are found in the Lianglitage formation, which is a typical maze karst cave system formed by epigenetic karst diffusion and infiltration and shares similarities in genesis with the Bullita karst cave system in the Judbarra region of Australia. The mudstone interval in the Upper Ordovician Qiaerbake formation serves as an aquiclude, which controls the lateral erosion of the karst cave system in the Lianglitage formation. The faults connecting surface water systems provide primary channels for karst water infiltration and erosion. As the regional base level drops, karst water infiltrates downwards along the fractures into the Middle Ordovician strata, forming fault-karst reservoirs in the Yijianfang formation. Understanding the “double-layer” maze epigenetic karst cave system of the Episode Ⅱof the Middle Caledonian in the Tahe oilfield is crucial for the development of Upper Ordovician reservoirs.

Key words: Tahe oilfield, Ordovician, Middle Caledonian, maze karst cave system, fault-karst reservoir, paleo-landform, paleo-water system

CLC Number:

TE122.2

ZHANG Changjian, JIANG Lin, WANG Yan, ZENG Qingyong, MA Xuejian. Characteristics of Maze Karst Cave System in Lianglitage Formation of Tahe Oilfield, Tarim Basin[J]. Xinjiang Petroleum Geology, 2024, 45(5): 522-532.

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井名	洞穴高度/ m	钻井液漏失量/m³	累计产液量/ 10⁴ t	累计产油量/ 10⁴ t
TK849CH井	3.51	561.00	42.83	4.47
TK719CH井			8.79	2.67
TK1122CH井	1.44	489.22	10.95	2.52
TK898H井	5.26	1 020.00	0.69	0.01