鄂尔多斯盆地华庆地区延长组长8储层特征研究

Study on Characters of Reservoirs in the Eighth Member of Yanchang Formation, Ordos Basin

鄂尔多斯盆地延长组长8是重要的储集层。储集岩主要为中细粒岩屑长石砂岩、长石砂岩和长石岩屑砂岩，成分成熟度低，结构成熟度中等；沉积环境和沉积相是该区储层发育的主要控制因素，沉积体系类型主要为冲积扇、湖泊三角洲沉积体系和湖泊沉积体系，并以湖泊三角洲沉积体系为主。沉积环境和沉积相控制了储层的内部构型特征和储层非均质性，进而影响油气藏的发育和分布。

The eighth member of Yangchang formation is an important reservoir. The main reservoir rock types include medium - small grain lithic arkose, arcose and feldspar lithic sandstone, which has a low compositional maturity and medium textural maturity. The key control factors to the reservoir development in the research block are sedimentary environment and facies. The sedi- mentary systems are composed of alluvial fan, lake delta and lacustrine sedimentary system, and lake delta sedimentary system is prevalent of all. Sedimentary environment and facies decide the internal configuration characters and reservoir heterogeneity, further affect the development and distribution of the gas reservoir.