摘要
利用岩心、薄片、测井等资料,研究了伊拉克艾哈代布油田上白垩统Khasib组的沉积相及其储层发育主控因素。研究区Khasib组主要发育碳酸盐岩缓坡和局限台地两种沉积相。Khasib组与下伏Mishrif组之间为不整合接触。Khasib组的沉积演化从碳酸盐岩缓坡泥岩开始,逐渐过渡到局限台地环境,发育多期叠置的生屑滩和砂屑滩。Khasib组碳酸盐岩是研究区重要的含油层系,主要储集岩为颗粒灰岩和泥粒灰岩,平均孔隙度22.17%,平均渗透率4.622×10-3μm,为高孔中低渗孔隙型储层。研究表明沉积相对Khasib组储层发育具有控制性,主要影响孔隙类型和孔隙结构。Khasib组沉积相研究能够为该油田的合理开发提供沉积学依据。
The sediment facies and its controlling effects on carbonate reservoir development of upper Cretaceous Khasib Formation in AHDEB oil field in Iraq were studied by core,thin section and well logging data. It was showed that the sedimentary facies of Khasib Formation was carbon- ate ramp and restricted platform. There were three sub-facies identified, they were shoal, plate and inner ramp. Khasib Formation was in unconformable contact with underlying Mishrif Formation. The evolution of sedimentary facies of Khasib Formation initiated with mudstone of inner ramp, and was transformed to restricted platform, with developing multi stage superposed shoals. The carbonate reservoir of Khasib Formation was an important oil-bearing formation in the studied ar- ea. The main lithology of reservoir were grainstone and packstone, with average porosity of 22.17% ,average permeability of 4. 622 X 10-a m, representing high hole, middle-low permeabili- ty reservoir. It was showed thatthe sedimentary facies was the controlling factor on Khasib For- mation reservoir development, it influenced the pores types and pores structure of limestone. The research of sedimentary facies of Khasib Formation provided sedimentary evidence for reasonable development of the oil field.
出处
《矿物岩石》
CAS
CSCD
北大核心
2014年第1期95-103,共9页
Mineralogy and Petrology
