In middle and late periods of the early permian , the pre - caspian areas rose successively , the climate became dry , and the environment turned to be supratidal zone ( evaporitic environment ) , resulting in the spread sedimentation of salts and the formation of the salt sediment group ( the upper part of the lower permian ) which consists mainly of halite and anhydrite 早二叠世中后期由于持续构造抬升，盆地气候变得乾旱，海水变浅，潮上带蒸发环境发育，以致这一时期广泛发育盐类沉积，形成含盐层系，主要由盐岩和硬石膏层构成，并形成许多大小不等的盐丘构造。
The gabled brick , tile , and freestone houses had almost dried off for the season their integument of lichen , the streams in the meadows were low , and in the sloping high street , from the west gateway to the medieval cross , and from the medieval cross to the bridge , that leisurely dusting and sweeping was in progress which usually ushers in an old - fashioned market - day 那些带有用砖砌的山墙和盖有屋瓦的石头房子，外面的一层苔藓已经因为干燥的季节差不多晒干脱落了草场上沟渠里的水变浅了，在那条斜坡大街上，从西大门到中古十字路，从中古十字路到大桥，有人正在不慌不忙地清扫大街，通常这都是为了迎接旧式的集市日子。
The paper has made a comprehensive study to marine carbonate oolitic reservoir in triassic of feixianguan group of intra - platform taphrogenic trough basin in north - east past of sichuan basin . according to the principle of high resolution stratigraphic sequence , combined with original results gained form the area , the author have built up the base level cycles and fades model of different stages based on the surface identification mark of base level cycle using the information of geology , seismic , logging , core and outcrops 1 、依据层序地层学高分辨率基准面旋回原理与识别技术，建立了裂陷槽向上变浅直至露出水面过程中形成的基准面旋回变化的7种特征性识别标志，包括泥岩表面干裂、淡水选择性溶蚀、白云化现象、白云岩、石膏、伽玛曲线高值、向上变厚、变粗序列、向上变细、变泥、变红序列、向上值变低序列等。
The annihilation of the octahedron voids at the tips of fpds was divided two processes : ( 1 ) the oxide on the void was removed by the out - diffusion of oi in the shallow region , especially the oi aroud the void and by the entry of the interstitial si atomics . ( 2 ) the void without oxide shrinked by emitting vacances and the migration of silicon atoms from edge to the bottom of void Fpds端部八面体空洞的消失分为两个阶段： (一)覆盖在空洞各个内壁上的氧化膜由于高温下硅片表面区域的间隙氧原子，尤其是空洞型缺陷周围的间隙氧原子的外扩散及自间隙硅原子的进入，而逐渐变薄直至最终消失。 (二)无氧化膜的空洞，在高温下发出一个个空位，同时八面体空洞周围的自间隙硅原子不断的从空洞的边缘迁移至空洞的底部，使空洞逐渐变浅直至最后消失。
Moreover , the system tracts in sequence are characterized by dualistic structure , namely transgressive - highstand system tracts , and tst > hst . the parasequences are divided into three types , which is respectively dominated by sandstones , mudstones , and shallowing - upward tidal flat system . and prograding sequence and retrograding sequence are composed of stacking parasequence set 层序中体系域具有二元结构特征，即海侵?高水位体系域，且tst hst ，准层序类型有三种，分别是以砂岩为主的准层序、以泥岩为主的准层序和以潮坪体系向上变浅的准层序。
