tuffaceous

The nature of mineralogy, petrology and geochemistry also provides reliable information to prove that primitive tuffaceous sedimentary rock underwent "soaking effect" in a kind of brine and formed scapolite biotite rock.

矿物学、岩石学及地球化学特征也为其原凝灰质沉积岩经过热卤水浸泡效应（soaking effect）形成方柱黑云岩类的成因提供了可靠信息。

Compared with low permeability glutenite, pore structure, relation of throat radius and permeability and separation of low permeability sandstone and low permeability tuffaceous sandstone is similar.

研究结果表明1.低渗透砂岩、低渗透凝灰质砂岩储层在孔隙结构类型、喉道与渗透率关系、分选性与渗透率关系等方面较为接近，而与低渗透砂砾岩相差较大。

The tuffaceous blanketed the entire basin.

凝灰岩充填着整个盆地.

Study of~ ( 237) NP adsorption on crushed tuff and tuffaceous sand

~（237）Np在破碎凝灰岩和凝灰质砂上的吸附研究

The tuffaceous formation , isolated remnants, are about 200-250 ft thick.

凝灰岩构造的局部残存段的厚度约为 200-250 ?铡?

For alkaline tuffaceous and ultra-alkaline tuffaceous reservoirs, it is should utilized the fracturing fluid to reduce filtration loss and enhance the preventing dilatability of fracturing fluid;

碱性和偏碱性凝灰质储层，应研究使用低滤失压裂液，降低滤失量，同时提高压裂液的防膨胀性能；

They reported the abnormal uranium content of waters issuing from tuffaceous rocks.

他们发现,从凝灰岩中流出的水中铀含量反常.

The types of reservoirs main include base rock weathering crust, sandstone, tuffaceous sandstone and conglomerate.

储层类型主要包括基岩风化壳 、 岩 、 灰质砂岩和砾岩.

oil shale always has the accompanying relationship with overlying sedimentary tuff or other tuffaceous strata.

油页岩常与上覆沉凝灰岩或其它凝灰质岩石呈伴生关系。

The other rocks, such as silicalite, jaspilite, spilite, tuffaceous sandstone, show high resistivity and low chargeability ( 1%~ 3%) in nature.

其余硅质岩、碧玉岩、细碧岩、凝灰质砂岩为高阻低极化，视极化率一般在1%~3%。