苏北盆地W凹陷阜四段烃源岩研究

摘要

基于大量的岩性资料和地球化学资料对W凹陷阜四段烃源岩研究表明，阜四段岩石类型主要为暗色机质含量丰富的泥质岩类，有效烃源岩以Ⅰ和Ⅱ型为主，该套有效烃源岩均具良好的生油能力；现今阜四段成熟烃源岩主要分布在深凹带内，由于不同地区剥蚀厚度的差异以及后期盐地层积厚度差异的影响，凹陷东西部地区在成熟深度上存在一定差异；究区阜四段排烃具有自身的特殊性，有机质丰度对于排烃强弱的影响相对较小，排烃的效率与所处烃源岩内部的位置有关，此外排烃效率与其构造背景、生储盖组合和成岩环境具有密切的关系。%Based on a large number of lithologic data and geochemical data,hydrocarbon source rock of the fourth member of Funing formation in W sag of Subei basin was studied. The results indicate that rock type of the fourth member of Funing formation is argillaceous rock with abundant dark organic matter, effective hydrocarbon source rocks are I and II type rocks, the sets of effective hydrocarbon source rocks have favorable oil generating capacity. Nowadays mature source rocks of the fourth member of Funing formation are mainly distributed in the deep sag zone. Due to the differences of denudation thickness in different regions and the difference of salt formation accumulation thickness difference at later stage, there are some differences in maturity depth in the study area; the fourth member of Funing formation in the study area has its own particularity, hydrocarbon expulsion will be less affected by the abundance of organic matter, hydrocarbon expulsion efficiency is related to the location of source rock, moreover, hydrocarbon expulsion efficiency has close relationship with its tectonic background, layer assemblage and diagenetic environment.