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首页> 外文期刊>Journal of Palaeogeography >Sedimentary facies and lithologic characters as main factors controlling hydrocarbon accumulations and their critical conditions
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Sedimentary facies and lithologic characters as main factors controlling hydrocarbon accumulations and their critical conditions

机译：沉积相和岩性是控制油气成藏的主要因素及其临界条件

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Abstract Taking more than 1000 clastic hydrocarbon reservoirs of Bohai Bay Basin, Tarim Basin and Junggar Basin, China as examples, the paper has studied the main controlling factors of hydrocarbon reservoirs and their critical conditions to reveal the hydrocarbon distribution and to optimize the search for favorable targets. The results indicated that the various sedimentary facies and lithologic characters control the critical conditions of hydrocarbon accumulations, which shows that hydrocarbon is distributed mainly in sedimentary facies formed under conditions of a long-lived and relatively strong hydrodynamic environment; 95% of the hydrocarbon reservoirs and reserves in the three basins is distributed in siltstones, fine sandstones, lithified gravels and pebble-bearing sandstones; moreover, the probability of discovering conventional hydrocarbon reservoirs decreases with the grain size of the clastic rock. The main reason is that the low relative porosity and permeability of fine-grained reservoirs lead to small differences in capillary force compared with surrounding rocks small and insufficiency of dynamic force for hydrocarbon accumulation; the critical condition for hydrocarbon entering reservoir is that the interfacial potential in the surrounding rock (Φn) must be more than twice of that in the reservoir (Φs); the probability of hydrocarbon reservoirs distribution decreases in cases where the hydrodynamic force is too high or too low and when the rocks have too coarse or too fine grains.
机译：摘要以渤海湾盆地，塔里木盆地和准gar尔盆地1000多个碎屑油气藏为例，研究了油气藏的主要控制因素及其临界条件，揭示了油气分布，优化了寻找有利条件的途径。目标。结果表明，各种沉积相和岩性特征控制着油气成藏的临界条件，表明油气主要分布在长寿命，相对较强的水动力环境下形成的沉积相中。在三个盆地中，有95％的碳氢化合物储集层分布在粉砂岩，细砂岩，石化砾石和含卵石的砂岩中。此外，发现常规油气藏的可能性随碎屑岩的晶粒尺寸而减小。主要原因是细粒油藏的相对孔隙度和渗透率低，与周围的岩石相比，毛细作用力差异较小，并且动力不足以促进油气成藏。碳氢化合物进入储层的关键条件是围岩（Φn）的界面势必须大于储层（Φs）的界面势的两倍。在流体动力过高或过低以及岩石的晶粒太粗或太细的情况下，油气藏分布的可能性就会降低。

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