潜山内幕地层的旋回性及其对储集性能的影响

辽河西部凹陷曙１０３块潜山中元古界长城系高于庄组组成，其沉积环境属碳酸盐岩台地潮缘，测井资料和地震剖面均显示出潜山内幕具两个明显的旋回层序。根据钻井岩心资料推断，这些旋回的岩性组合是：泥晶白石岩，层状叠层石白云岩，锥状叠层石白云岩或凝块石白云岩，它们分别形成于不同的水动力条件，因此其岩石结构，构造及孔隙发育程度都不尽相同。

Sedimentary Cyclicity of Internal Strata and Its Effects on Reservoir Characteristics

Block Shu 103 buried hill of the western depression in Liaohe oilfield consists of Gaoyuzhuang formation, Changcheng (Great Wall) system,middle Proterozoic erathemIts sedimentary environments belong to a carbonate peritidal zone Well logging data and seismic profiles show that internal strata of the buried hill have two distinct sedimentary cyclic sequencesFrom drilling cores,it is deduced that these cycles are composed of micrite,laminate stromatolite, conophyton or thrombolite dolomites,formed under the different dynamic conditions and with various levels of texture, structure and porositySome rocks,such as conophyton and thrombolite dolomites, are the products in mediumhigh energy zones, with coarse texture,well developed primary porosity, pore filled later and better solution openings and caves for dissolution, the others belong to the products in lower energy zones with worse porosity and texturesThe cyclic variation in petrology, and the difference in weathering and dissolution at various positions may affect production capability of oil wells