冀东油田北堡地区东营组储层特征及其主控因素

CONTROLLING FACTORS ON RESERVOIR PROPERTIES OF THE DONGYING FORMATION IN BEIBAO AREA OF JIDONG OILFIELD

利用大量的岩石薄片、压汞曲线、岩石物性分析资料以及沉积相、地震相分析资料，从储层特征分析入手。分析了南堡凹陷北堡地区储层的岩性和成岩作用特征，进一步揭示了目的层储层性质的主要控制因素。结果表明，在北堡地区，东营组砂岩结构成熟度低是储集物性差的基本原因。储层物性演化受成岩作用控制，而本区目的层成岩作用又受岩石的低成分成熟度制约。

The sandstone reservoir rock at Beibao area of Jidong oilfield are characterized by poor pore structure, low permeability and high content of authigenic kaolinite and chlorite, hence potential sensitivities to acidization and high percolation flow velocity. An integrated evaluaoion of the reservoirs shows that sandstones of Ed1 member are good to moderate reservoir rocks. Sandstones in Ed2 member and sandgroup I of upper Ed3 member are moderate reservoir rocks, and those in sand group Ⅱ andⅢM of upper Ed3 member are poor reservoir rocks or even non-reservoir rocks. The above mentioned features are controlled mainly by lithology (or lithofacies) and the diagenesis. The Dongying formation reservoirs are mainly fine-sandstones of low compositional maturity and low textural maturity. The high matrix content, poor sorting and fine grainsize resulted in a poor primary pore structure, low permeability and low productivity of the reservoirs..