鄂尔多斯盆地西南部长6油层组浊流沉积及其分布特征

在鄂尔多斯盆地西南部长6油层组的半深湖—深湖亚相中发育有大量的浊积岩,构成该地区主要储层类型,成为油气勘探的重要区域.其以薄互层的形式出现,具有分布不稳定、隐蔽性强的特点.文章从沉积构造、砂体结构、电性和地震反射等方面总结了浊流沉积的特征,采用地质、测井与地震相结合的技术手段,预测了长6油层组浊积砂体的平面分布特征.研...

Sedimentary characteristics and distribution of turbidite of Chang 6 oil reservoir formation in the southwest Ordos Basin

Turbidite is widely developed in the bathal-abysmal lake subfacies of Chang 6 oil reservoir formation in the southwestern ordos Basin.The trubidite constitutes main reservoirs in this area and is the important oil-gas exploration target.it is characterized by thin interbeds and irregular distribution thus tends to be disguised.This paper summarizes characteristics of the turbitite with respect of its sedimentary structure,structure of sand body,electric property and seismic reflection.Data of geology,logging and seismic survey are combined to predict plan distribution of the turbitite.Results show two obvious turbidite zones varied in spacial extension and and size of sand body:①Baibao-Huachi zone in Huaqing area whose turbitite was deposited on gentle slope with larger size of layeroid sand body in plan;②Zhengning-hesui zone whose turbidite deposited on steep slope with smaller size of sand body in flower and fan shape in plan.