Abstract Globally, lacustrine carbonate rocks are often found in rift lake basins. Because they do not form large-scale conventional or unconventional reservoirs, have received enough attention previous oil and gas exploration. Recent years, exploration examples China show that has close relationship with gas. Mudstone deposits always a good effect the area. However, genesis of is still controv...

The rheological properties of soft rocks should be considered in the long-term design and maintenance deep-buried tunnels using uniaxial single-stage loading graded incremental cyclic-loading methods. In this article, creep tests were performed on silty mudstone from a specific water conveyance tunnel China, with buried depth range 1650–2320 m subjected to high situ stress. curves under differe...

To determine the metamorphic ages of accretionary complexes in Northern Chichibu Belt SW Japan, K–Ar dating was conducted using weakly metamorphosed sedimentary rocks collected from Kanto Mountains, Central Japan. Whole-rock were obtained for chert and red shale samples, mineral fine-grained illite with a grain size less than 4 μm chert, shale, mudstone, acidic tuff, basic tuff. The presented l...

Acritarchs are a group of organic-walled microfossils with unknown biological affinities. The wall ultrastructure of the unornamented, smooth Leiosphaeridia sp. and the acanthomorphic Gyalosphaeridium pulchrum from the Ediacaran Dey Dey Mudstone in the Officer Basin, South Australia, was studied by use of transmission and scanning electron microscopy, and transmitted light microscopy. The study...

The Early-Middle Miocene succession in Iraq is represented by the Serikagni, Euphrates and Dhiban formations, which deposited during Early Miocene. Jeribe Fatha successions were Middle age. This study includes microfacies analysis, depositional environments, sequence stratigraphy basin development of – middle Hamrin Ajeel oil fields Mansuriyha Gas Field. area four boreholes three located centra...