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纤维状结构脉体在泥质岩中普遍发育,根据其微观岩相学不同可分为晶体拉伸、延长块状以及特征纤维状结构脉体;根据其生长岩相学差异又可分为拉伸式、向生式和背生式脉体。脉体最终结构主要由裂缝面的形态特征、裂缝宽度和充填裂缝脉体矿物的生长习性所决定。裂缝开启—闭合机理只能用于说明晶体拉伸结构以及延长块状结构脉体的形成过程,背生式特征纤维状结构脉体是在岩石形变过程中裂缝未开启且晶体生长竞争被抑制的情况下通过成脉物质扩散流动运输,晶体由中间面向两侧连续生长形成的。泥质烃源岩中有机质生烃导致异常高压产生的水平裂缝是平行于纹层背生式方解石脉形成的首要条件,在局部范围内可以提高生排烃效率并影响烃类运移的速率和方向,证明油气存在顺平面的侧向运移,因此平行于纹层背生式方解石脉可以作为超高压排烃和油气运移的标志,也可将其作为泥质烃源岩生烃和油气初次运移的主要证据。
The veins of fibrous structure are generally developed in argillaceous rocks. According to their microscopic petrography, the veins can be divided into crystal stretching, extending massive and characteristic fibrous structure veins. According to their differences in lithofacies, Stretching, to the students and back-style veins. The final structure of veins is mainly determined by the morphological characteristics of the fracture surface, the width of the fracture and the growth habit of the filling fractured veins. Crack opening-closing mechanism can only be used to explain the crystal tensile structure and the extension of the formation of massive body pulse body, back-style feature fibrous structure veins in the rock deformation crack is not open and competition for crystal growth is inhibited In the case of flow transport through the diffusion of veins, the crystal grows continuously from the middle to both sides. Horizontal fractures caused by abnormally high pressures of hydrocarbon generation in the muddy source rocks are the primary conditions that are parallel to the formation of the ungainitic calcite veins. In the local area, the rate of hydrocarbon generation and expulsion can be enhanced and the rate of hydrocarbon migration can be enhanced. Therefore, parallel to the reclaimed calcite veins can be used as a marker of ultrahigh-pressure hydrocarbon expulsion and hydrocarbon migration. It can also be used as a source of hydrocarbon generation and hydrocarbon accumulation in shale source rocks The main evidence of migration.