Research Article

Characteristics of Carboniferous Volcanic Reservoirs in Beisantai Oilfield, Junggar Basin

Table 1

Brief stratigraphic table of Xiquan block.

FormationSymbolThickness mBrief description of lithology and lithofacies
TieSystemGroup

QuaternaryQ410∼440Mainly gray-yellow clay, mixed with colored gravel and sandy gravel

NeogeneN738∼933The middle and upper parts are mainly composed of gray-yellow mudstone, sandy mudstone, and gravel-bearing mudstone with gypsum mudstone and argillaceous siltstone, and the lower part is mainly composed of gray-yellow mudstone, sandy mudstone, and sandy mudstone mixed with brown-gray mudstone and small mudstone conglomerate

PaleogeneE115∼227Red-brown, gray mudstone, and sandy mudstone are mainly intercalated with argillaceous siltstone, siltstone, gravel-bearing siltstone, and glutenite

CretaceousLowerTugu LuqunK1tg275∼441The middle and upper parts are mainly composed of brown-gray, gray-brown mudstone, and sandy mudstone interbedded with brown-gray argillaceous siltstone; the lower part is interbedded with gray and brown argillaceous siltstone, siltstone and brown and gray silty mudstone

TriassicLowerShaofanggou groupT1s0∼117Red-brown, gray-brown mudstone, and sandy mudstone are mainly mixed with gray, brown-gray, variegated gravel-bearing fine sandstone, gravel-bearing medium sandstone, and glutenite
Jiucai Garden groupT1j42∼169Red-brown, gray-brown mudstone, and sandy mudstone are mainly mixed with gray, brown-gray, variegated gravel-bearing fine sandstone, gravel-bearing medium sandstone, and glutenite

PermianUpperWutonggou FormationP3wt8∼136Taupe, gray mudstone, silty mudstone, and even gray argillaceous siltstone

CarboniferousUpperBatamayC2b48∼907Gray, brown-gray, and brown volcanic breccia with green-gray, gray-green, gray-black andesite, tuff, and carbonaceous mudstone