辽河西部凹陷沙三段浊积岩储层中钙质夹层研究

本文阐明了辽河西部凹陷高升、兴隆台、曙光和冷东四个地区沙三段浊积岩油气储层内的钙质夹层识别标志，定性、定量地揭示了它在剖面和平面上空间分布规律，探讨了它的成因机制，指出了钙质胶结作用和钙质夹层对储层性质与油气分布的重要影响。

Study on Calcareous Interbeds in Turbidite Reservoir of Sha 3 Member of the Liaohe Western Depression

At first, on the basis of abservation and study on cores and using quantitative information about logging data abundantly, the recognized lithologic and logging configurations of calcareous interbeds occurring in the turbidite reservoir of the Sha 3 member are clarified in the four areas (oilfields) such as Gaosheng, xinrongtai, Shuguang and Lengdong of the Liaohe western depression. The law of spatial distribution of calcareous interbeds formed by carbonate cementation is discovered by qualitative to quantitative analyses from point to plane and from plane to three dinension. The distribution of calcareous interbeds is abviously controlled by sediment gravity flow, sedimentary microfacies and fault. Then, according to the study on the material composition and diagenesis of reservoirs, mineral petrology and distribution of calcareous interbeds the genetic mechanism of calcareous interbed is discussed. Calcareous interbeds are mainly formed by diagenesis. Under the action of acid water, the clay mineral evolution from montmorillonite to kaolinite and the dissolution and alteration of unstable compositions such as faldspar, rock fragments and carbonate minerals etc., provide the material source of Ca 2+ , Mg 2+ and HCO - 3 for carbonate cementation and the formation of calcareous interbeds. Fault and microfacies have played an important role in the flowing of acid water and the formation of calcareous interbeds. At last, the authors put forward that calcite cementation and calcareous interbeds have an obvious effect on the reservoir properties and the distribution of petroleum.