大庆长垣及以西地区泉三、四段扶杨油层储层特征

大庆长垣及以西地区下白垩统泉头组三、四段扶杨油层油气资源潜力较大,是大庆油田近年来后备储量的主要来源.但是,单井石油产能低,储量丰度低,直接影响了探明储量的升级及开发.为此,迫切需要开展直接影响产能的储层特征研究,以寻找高丰度储量区块.该文就是针对大庆长垣及以西地区下白垩统泉头组三、四段扶杨油层,在层序地层和沉积相研究的基础上,系统地研究了储层特征.研究区储层主要为三角洲平原分流河道及三角洲前缘水下分流河道砂体;河道砂体单层厚度小,岩石颗粒细;砂岩总体上为低渗透储层;砂体的埋深和沉积类型是储层物性的主控因素,溶蚀孔隙可以改善砂岩物性;齐家-古龙凹陷周边为较有利、有利储层发育区,是下一步勘探及发现高丰度储量的重点目标区.

Reservoir characteristics of Fuyang oil layer in Q3 and Q4 Member in Daqing placanticline and area to its west

The hydrocarbon potential in Fuyang oil layer of lower Cretaceous Q3 and Q4 Member in Daqing placanticline and the area to its west is relatively great, and it is the main candidate reservoir for Daqing oilfleld in recent years. However, due to low productivity of single well and low reserves abundance, the development of discovered reserves is affected. So, it is necessary to study on reservoir characteristics, which affect the productivity directly, to seek for blocks with high reserves abundance. Focus on Fuyang oil layer in lower Cretaceous Q3 and Q4 Member of Daqing placanticline and area to its west, this paper systematically studies the reservoir characteristics on the basis of sequence stratigraphy and sedimentary facies. The reservoirs in the study area are mainly delta plain distributary channel sand body and delta front underwater distributary channel sand body. The sand body has small individual layer thickness with fine rock particles, the sandstone belongs to low permeability layer, the buried depth of sand body and sedimentary types are the main dominant factors for reservoir physical properties, and dissolution pores can improve the physical properties of sandstone. The area around Qijia - Gulong depression is relative fine reservoir development region, which is the main target for further exploration to discover high abundance reserves.