The Shenhu area, located on the northern continental slope of South China Sea, is a confirmed gas hydrate-enriching region, but sedimentary unit, causative mechanisms, and evolution processes strata that contain hydrate remain unclear. Furthermore, recognition bottom simulating reflectors (BSRs) rests qualitative description; there no quantitative method for characterization or three-dimensional depiction BSRs. This review examines features key factors controlling distribution in based...

Distributary channels at the delta front of lacustrine basins play a crucial role in transporting terrigenous sediments and redistributing depositional facies along basin margin. These are also significant reservoirs for oil gas. This study investigates Triassic Yanchang Formation Southeastern Ordos Basin (China), emphasizing sedimentary characteristics, hydrodynamic processes, evolutionary patterns distributary channels. Special focus is given to response filling paleotopographic changes...

Mud clasts are common in non-marine to marine sedimentary records, however, why lack a widely accepted classification scheme? We propose that it is the relative balance of volumetric abundance, sorting, roundness, and grain size controls texture fabric mud clasts. Nine distinct types identified study based on quantitatified properties, fall into two groups coarse-grained fine-grained. The generation can be assigned failure, erosion, and/or bioturbation muddy sediment. These transported...

Abstract: The Rockcave Member of the Yungang Formation (Middle Jurassic), in Datong Basin, China, is a multistory sandstone that interpreted as sandy braided fluvial deposit based on grain size, lithofacies, and architectural elements. depositional setting was mountain front which tens kilometers from shoreline lacustrine basin during Middle Jurassic. concept base level used to analyze elements system obtained photographic mosaics high-resolution measurement six outcrop sections Rock Cave....

Abstract Junggar Basin, located in northern Xinjiang, presents continuous and multikilometer-thick strata of the Jurassic deposits. The was entirely terrestrial fluvial lacustrine deltaic sedimentation. Eight outcrop sections across were measured at a resolution meters southern Basin. Controlling factors sedimentary evolution palaeoclimate changes Basin during discussed based on lithology, fossils tectonic setting. In Early to Middle Jurassic, warm wide Tethys Sea generated strong monsoonal...

Abstract The East China Sea Shelf Basin was a back‐arc basin located at the active continental margin of western Philippine Plate. This study explores facies and architectural changes from tide‐influenced deltas to tide‐dominated estuaries in transgressive–regressive cycles, as well their controlling factors. Cores, wireline well‐logs seismic data allow sedimentary architectures models depositional systems be reconstructed. In Xihu Depression Basin, stratigraphic sequences Eocene Pinghu...

There is great potential for hydrocarbon exploration in the Triassic Baikouquan Formation, Mahu Depression of Junggar Basin, NW China. Controversy remains around conglomerate categories coarse-grained deltas, which has inhibited further this area. Based on a dataset cores, test data, well logs and seismic, study attempts to recognize different genetic types conglomerates formed within deltas. The Formation been divided into nine facies basis textures, grain size sedimentary structures. From...

The West Bogda Mountains separate the two largest petroliferous sedimentary basins in Northwest (NW) China and may record evolution history of Central Asian Orogenic Belt (CAOB). timing initial uplift is debated, which provide robust constraint on CAOB evolution. Here we present an integrated study sedimentology, geochemistry, detrital zircon geochronology to constrain Mountains. late Lower Permian Lucaogou Formation dominated by organic-rich laminated shale, gravity flow deposits dolomite...

Thick sequences of terrestrial multicolored mudstones the Middle Jurassic Shaximiao Formation in Sichuan Basin, Southwest China, effectively recorded paleoclimate and paleoenvironment changes. The is reconstructed by using detailed sedimentological elemental geochemical analysis mudstones. provenance, paleoclimate, paleosalinity, paleoredox conditions are distinguished discriminant indicators CIA, C-value, Sr/Cu, Rb/Sr, Th/U, V/Cr, V/(V + Ni). results show that all samples derive primarily...

When reservoir heterogeneity is strong, there a great error between the calculated oil saturation based on J-function and actual interpreted by logging. Aimed at this problem, quality index proposed to classify average mercury curves, model original are established, experimental measurement numerical simulation with an illustration of oilfield in Pearl River Mouth Basin. The method accords closely that logging, it reliable show properties strongly heterogeneous reservoirs. In addition, paper...

Abstract The Shan 2 Member, 1 Member and He 8 of the Mid–Late Permian Shanxi lower Xiashihezi formations, in southeastern Ordos Basin, together comprise ∼150 m deltaic deposits. This sequence records an overall evolution from deep marine environment to shallow lake associated with braided river, river delta meandering delta. Core description, well log interpretation, stable isotope analysis, including carbon, oxygen strontium, were conducted understand sedimentary Member. Formation, which...

This paper presents the current body of knowledge regarding evolution a braided–meandering system in southern Junggar Basin, north‐west China, based on preserved architecture evidences. The response to climate change was also discussed. Herein, 10 types lithofacies are summarized, including information their primary sedimentary structures, characteristic lithology, and geometry. study focuses recognizing architectural elements within channels (migrating channel: CHm, switching CHs,...

Gas hydrate samples were first obtained in the Dongsha area, South China Sea (GMGS2) 2013. High-resolution 3D seismic data area show various small landslide bodies developed as huge mass transport deposits. These are divided into seven types on basis of their shapes, internal structures and geneses (slide, collapse deformation above BSRs, well slump wedge, lens, block sheet below BSRs). Based this classification, detailed studies conducted, including measurements body sizes slope gradients...

Sequential Gaussian simulation method is taken as an example to analyze the characteristics and defects of stochastic methods, a modeling strategy proposed that based on results seismic inversion improve accuracy. Stochastic can only achieve "mathematical reality" by recovery parameter's macro statistical regularity through examples, forward model verify whether deviate from "geological reality". Seismic reliability geological model, constrained accuracy For braided river delta, in condition...

Abstract Submarine or sub-lacustrine lobe deposits are important reservoirs, but the fan fringe form heterogeneities within deep water deposits. Fan facies records complex sediment gravity flow types. By understanding of bed types and mechanisms, we can identify deposit, which aids in reconstruction reservoir evaluations. The Jiucaiyuanzi Dalongkou sections West Bogda Mountains preserve well-exposed 536-m 171-m thick successions, respectively, a lacustrine depositional system from Middle...

In recent years, enriched hydrocarbon reservoirs have been largely founded in the Lower Triassic Baikouquan Formation, Mahu Depression of Junggar basin, northwestern China. Accordingly, sedimentologic complexity associated deposits has extensively studied, though most them focused on local oil‐producing fields separately. this research, a detailed sedimentary study entire conducted, which include several aspects characteristics, sediment provenance, evolution, and controls coarse‐grained...

Abstract Delta systems are ubiquitous around lacustrine rift basins. Its peripheral geometry, progradation structures and sedimentary successions were controlled by both tectonic settings climatic changes. Peripheral geometry of a delta was strongly influenced depositional gradients which formed the fan-shape on steep slopes developed lobe-shape gentle slopes. Due to discharge feed rivers can change rapidly driven variations, nearshore area deltas display considerable facies variability. The...