To investigate the impact of CO 2 on rocks during whole period pre-pad energized fracturing operation for thin interbedded shale reservoir, including and well shut-in, a series laboratory triaxial experiments soaking were conducted (from Jimsar formations). In these experiments, combined with computed tomography (CT), effect fluid, horizontal principal stress difference, vertical stress, natura...

We investigated leaf, cone and fruit impressions preserved in a siltstone deposit between coal seams the late Paleocene Tongue River Member near Otter, southeast Montana, to assess floristic diversity composition. document presence of Taxodium based on seed scales as well foliage branches associated pollen cones, low-diversity angiosperm assemblage about 15 genera dominated by Platanaceae (Plat...

the biqian-10 block, located in henan oilfield of sinopic, contains many thin and interbedded reservoirs, which have been operated by cyclic steam stimulation for 20 years or more. therefore, it is a challenge to implement the conventional steam flooding. in order to improve the recovery of steam flooding, urea was used to assist steam flooding. urea can decompose into co2 and nh3, which are be...

The oldest theropod dinosaurs are known from the Carnian of Argentina and Brazil. However, the evolutionary diversification of this group after its initial radiation but prior to the Triassic-Jurassic boundary is still poorly understood because of a sparse fossil record near that boundary. Here, we report on a new basal theropod, Daemonosaurus chauliodus gen. et sp. nov., from the latest Triass...

Dolomites and eruptive rocks are well-developed in the Permian Fengcheng Formation Junggar Basin China, which oil gas accumulated extensively. Until now, high-yield industrial flows have been obtained dolomitic tuff of second unit Formation, demonstrates huge exploration potential thick layer massive tuff. The lithology this area has gradually transformed from dolomite, to siltstone east west. ...

In this paper, the mechanical behaviors of different lithological rocks coal measure strata from Shanxi Formation in eastern margin Ordos Basin, China, were investigated through uniaxial compression tests, and deformation characteristics failure modes investigated. On basis, energy evolution lithology was also discussed. The results show that there are obvious differences properties strata, res...

Field mapping, colour, particle size distribution, pH and x-ray diffraction studies were undertaken to elucidate the genesis of Ediki kaolin. The kaolin occurs within the Mungo formation of upper cretaceous age, ascribed to the Douala sedimentary basin. The kaolin profile consists of upward coarsening sandstone – siltstone – sandstone sequence with a gradient of 35 to 40°. Texturally, the kaoli...