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首页> 外文期刊>Petroleum exploration and development >Fracture characteristics and genetic mechanism of overpressure carbonate reservoirs: Taking the Kenkiyak Oilfield in Kazakhstan as an example
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Fracture characteristics and genetic mechanism of overpressure carbonate reservoirs: Taking the Kenkiyak Oilfield in Kazakhstan as an example

机译：超压碳酸盐岩储层的断裂特征及成因机理-以哈萨克斯坦肯基亚克油田为例

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Taking the Kenjiyak Oilfield in Kazakhstan as an example, the fracture characteristics and genetic mechanism of carbonate reservoirs with overpressure were discussed. The study showed that carbonate reservoirs are formed under overpressure developed hydraulic fractures besides tectonic fractures and karstic fractures. The Carboniferous sub-salt hydraulic fractures in Kenkiyak are mainly formed in the Mesozoic and Cenozoic, on a macroscopic level they cut rocks into brecciated texture or are packed by calcite veins, on a microscopic level they are in a radiant distribution around pores. The formation and evolution of the fracture system in the region experienced three main stages, including structure transforming and uplifting, structure stretching and subsiding, and hydraulic cracking. In the stage of hydraulic cracking, salt movement and tectonic movement lead to the formation of overpressure zone, with the pressure coefficient of 1.84. Overpressure leads to the formation of hydraulic fractures in the Carboniferous low permeable carbonate reservoirs under the Permian non-permeable mudstones, and also leads to reopening, widening and prolonging of former tectonic fractures. Hydraulic fractures are mainly the extensional fracture, which has late opening time and low filling degree, thus is the main effective fractures in the study area.
机译：以哈萨克斯坦肯吉亚克油田为例，探讨了超压碳酸盐岩油藏的裂缝特征及成因机理。研究表明，碳酸盐岩储集层是在构造裂缝和岩溶裂缝之外的超压水力裂缝下形成的。 Kenkiyak的石炭纪盐下水力压裂主要形成在中生代和新生代，在宏观层面上它们将岩石切成角砾状纹理或由方解石脉堆积，在微观层面上它们分布在孔隙周围。该地区裂缝系统的形成和演化经历了三个主要阶段，即结构转换和抬升，结构拉伸和沉降以及水力开裂。在水力开裂阶段，盐分运动和构造运动导致超压带的形成，压力系数为1.84。超压导致在二叠系非渗透性泥岩下的石炭系低渗透性碳酸盐岩油藏中形成水力压裂，并导致以前的构造裂缝重新开放，扩大和延长。水力裂缝主要是张性裂缝，张开时间晚，充填度低，是研究区内主要的有效裂缝。

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