松南地区登娄库组砂岩成岩作用与孔隙演化

松辽盆地南部下白垩统登娄库组发育一套湖相水下扇沉积、演浅湖沉积和三角洲沉积，该组的砂岩厚度占地层总厚度的４３．３３％，是该区深部油气的主要储层。砂岩的成岩作用主要包括粘土边的形成、压实（压溶）、胶结、溶蚀－充填及交代作用等。成岩作用极大地影响了储层的储集性能，其中压实作用、胶结作用导致孔隙度降低，而不稳定的矿物颗粒溶蚀和碳酸盐类胶结肠的溶解导致孔隙度增大。研究表明，该区登娄库组的胶结作用发生在９０

Diagenesis and Porosity Evolution of Lower Cretaceous Denglouku Formation in Southern Songliao Basin

The Denglouku Formation (Lower Cretaceous) in the Songliao Basin consists of underwater fan, littoral-shallow lacustrine and delta factes. The total thickness of sandstones takes up 43. 33% in the formation, which is a major target for deepexploration of oil and gas. Diagenesis has a great effect on the nature of reservoir rocks,compaction and cementation lead to decrease in porosity, whereas solution of unsteady minerals and carbonate cements result in increase in porosity. The cementation of the Denglouku Formation has occured since 90 Ma, and principal accumulation of oil and gas since 92 Ma. As hydrocarbon accumulation in the formation obstructed the further diagenesis, it can be concluded that a great part of pores still conserved in the Denglouku Formation.