鄂尔多斯盆地郝家坪地区延长组油藏富集规律研究

The characterization about petroleum accumulation of Yanchang formation at Haojiaping area of Ordos basin

鄂尔多斯盆地是我国重要的含油气盆地,多种能源矿产同盆共存。经钻井岩芯及薄片鉴定发现,郝家坪地区三叠系延长组长2、长4+5、长6储层岩石类型以长石砂岩、长石岩屑砂岩为主,长2储层喉道以细喉为主,长4+5、长6喉道以细喉、微细喉为主。长2油层组主要为河流相、长4+5及长6油层组主要为三角洲相。油藏主要为岩性油气藏和构造-岩性油气藏,油气藏的聚集与分布主要受岩性、沉积相和构造等因素的控制。

With the amount of significance,Ordos basin has its special value in the common existence of various mines in our country.According to the such data as the cores and thin section,the sandstone of Chang 2,4 ＋5,6 formation mainly consists of arkose and feldspathic lithic sandstone which make the throat of Chang 2,4＋5,6 mainly thin and a little bit micro in4＋5,6.During sedimentary period,Chang 2 develops river facies while Chang 4＋5 and Chang6 mainly have delta facies.Being affected by lithology,sedimentary facies and tectonic,petroleum accumulation mainly is classified as lithological or lithological-tectonic types.