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Hydrocarbon migration in fracture-cave systems of carbonate reservoirs under tectonic stresses:A modeling study

Petroleum Research 2019年第4期4卷 354-364页

作者： Chenjun Huang Geyun Liu Yongsheng Ma Xingui Zhou Linyan Zhang Jinyin Yin Jinrui Guo Petroleum Exploration and Production Research Institute SINOPECBeijing100083China Center of Journals&Annals Hebei GEO UniversityShijiazhuang050031China China Petroleum&Chemical Corporation Beijing100728China Oil&Gas Survey China Geological SurveyBeijing100083China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing100081China

The Tahe oilfield,located in the southwest of the Akekule nosing structure,northern Tarim basin,was the most prolific oilfield targeting at the Ordovician carbonate reservoirs in *** reservoir space was dominant with fracture-cave systems commonly induced by tectonics and *** hydrocarbon production had proceeded for two decades in the Tahe oilfiled,the control of oil and gas accumulations was still *** this work,the periodic fluid flow induced by cyclic tectonic stresses was proposed as the mechanism of hydrocarbon migration in the fracture-cave systems of carbonate *** fracture networks formed conduits for fluid flow,and the fluid pressure in caves transmitted from stress field provided the driving *** constitutive equations were established among stresses,fracture densities and flow *** quasi-3D geological models were constructed to simulate the flow velocities on the Ordovician surface of Akekule nosing structure in the critical tectonic *** simulated results supplied indicative information on oil and gas migration and accumulation in the tectonic *** with the oil and gas charge history,a conceptual model was built to reveal the multi-stage oil and gas charge and accumulation in the Ordovician of Akekule nosing structure.

关键词： Fracture-cave system periodic fluid flow Numerical modeling Oil and gas accumulation Akekule nosing structure Tarim Basin

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Hydrocarbon migration in fracture-cave systems of carbonate reservoirs under tectonic stresses: A mechanism study

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Petroleum Research 2020年第2期5卷 124-130页

作者： Chenjun Huang Geyun Liu Kaibo Shi Jinyin Yin Jinrui Guo Chongzhi Tao Petroleum Exploration and Production Research Institute SINOPECBeijing100083China Center of Journals&Annals Hebei GEO UniversityShijiazhuang050031China School of Earth and Space Sciences Peking UniversityBeijing100871China

The fracture-cave systems of carbonate reservoirs have almost stored 30% of recoverable oil and gasaround the world. However, it is still doubtful about the mechanism of hydrocarbon migration in thefracture-cave systems. In this work, deducing from the Eshelby’ solution, we derived the equation tocalculate the bulk strain of elliptic cylinder caves applied by stresses. Calculated results indicate that thebulk strain of caves negatively increases with the radius ratio of the elliptic cave axials under fixedstresses. In the case of the effective horizontal stress increasing from 30 MPa to 80 MPa, the bulk straindifference of a cave could be up to 0.5%. It may result in 0.4% of the total cave volume of fluid transportingthrough the fracture-cave systems within such a stress cycle. Since the tectonic stresses transform in acyclic way, the volumetric ratio of new-to-old fluid in a cave would increase with the number of stresscycles. As a result, we proposed that the periodic fluid flow induced by cyclic tectonic stresses could be animportant mechanism for hydrocarbon migration in the fracture-cave systems of carbonate reservoirs.

关键词： Eshelby’solution Bulk strain Cyclic tectonic stress periodic fluid flow Fracture-cave system Carbonate reservoir

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