Medium hard formation with high compressive strength. Such as hard shale, limestone, sandstone, dolomite, anhydrite and marble.
高抗压强度的中硬地层，如硬页岩。石灰岩。砂岩。白云岩。和硬石膏。大理石。
Low compressive strength of soft to medium formations. Such as soft shale, soft limestone, soft sandstone, hard and soft abrasive interbedded medium formation.
低抗压强度的软到中等地层，如中软页岩。中软石灰岩。中软砂岩。和软硬研磨性夹层的中等地层。
The reservoir rocks consist of conglomerate, pebbly sandstone, medium-fine sandstone and siltstone.
储层岩石类型有砾岩、含砾砂岩、中细砂岩及粉砂岩。
Lithology of the Chang-8 oil reservoirs is mainly fine-medium lithic feldspathic sandstone and feldspathic detritus sandstone.
长8油层组储层岩性以细—中粒岩屑长石、长石岩屑砂岩为主。
The sandstone reservoir of this area is characterized by medium porosity and low permeability.
本区砂岩储集层具有中孔低渗特点。
The Haojiahe sandstone copper deposit occurs in the red elastic rock formation of Mesozoic continental facies in central Yunnan, being a medium size one.
郝家河砂岩型铜矿床产于滇中中生代陆相红色碎屑岩建造中，规模中型。
The Upper Triassic Series in the Zixing-Rucheng coalfield in southeastern Hunan is a set of grayish black sandy mudstone, fine sandstone, medium coarse sandstone and coal seams combination.
湘东南地区资汝煤田上三叠统为一套灰黑色砂质泥岩、细砂岩、中粗粒砂岩以及煤层等沉积组合，具有砂泥薄互层层理、斜波状层理、水平层理及大型交错层理等沉积结构。
The former is wide spread in each of the basins, with the Tertiary sandstone possessing the best reservior property, generally being above the medium grade.
前者在各中、新生代陆相盆地普遍发育，其中以第三系砂岩的储集性能最好，一般具中等以上。
In the part of west flank of Lujiatuo minefield, the normal siltstone roof of coal seam 8 changed into coarse to medium-grained sandstone, and also had phenomenon of coal seam pinch-out.
吕家坨井田西翼部分区域八煤层顶板由正常的粉砂岩变为粗中砂岩，并有煤层变薄现象。
Therefore, Jixi basin is difficult to form large areas of deep basin gas, but, in the local economic value of small and medium tight sandstone gas reservoirs can be formed.
因此，鸡西盆地难以形成类似川西坳陷的大型致密砂岩气藏，但在成藏条件优越的局部地区可形成具有经济价值的中小型的致密砂岩气藏。
Suitable for medium to medium hard formations such as sandstone, limestone and dolomite.
适用于中至中硬地层中使用，如砂岩、石灰岩及白云岩。
Pores are closely correlated with sandstone fabric, and are more easily generated in medium grained sandstone where feldspar content is high(>37%) and cement content is low(carbonate<50%).
孔隙与砂岩组构密切相关，孔隙更容易产生于长石含量高（>37% ）、且胶结物含量低（碳酸盐<5 % ）的中粒砂岩中。
E2S2 is mainly the interbeds of gray medium-fine sandstone and dark gray mudstone in different thickness and with good reservoir properties.
沙二段岩性主要为灰色中细砂岩与深灰色泥岩不等厚互层，储层物性较好。
E2S2 is mainly the interbeds of gray medium-fine sandstone and dark gray mudstone in different thickness and with good reservoir properties.
沙二段岩性主要为灰色中细砂岩与深灰色泥岩不等厚互层，储层物性较好。
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