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| 1 | Lithofacies paleogeography mapping and reservoir prediction in tight sandstone strata: A case study from central Sichuan Basin, China显示文摘Sand-rich tight sandstone reservoirs are potential areas for oil and gas exploration. However, the high ratio of sandstone thickness to that of the strata in the formation poses many challenges and uncertainties to traditional lithofacies paleogeography mapping. Therefore, the prediction of reservoir sweet spots has remained problematic in the field of petroleum exploration. This study provides new insight into resolving this problem, based on the analyses of depositional characteristics of a typical modern sand-rich formation in a shallow braided river delta of the central Sichuan Basin, China. The varieties of sand-rich strata in the braided river delta environment include primary braided channels,secondary distributary channels and the distribution of sediments is controlled by the successive superposed strata deposited in paleogeomorphic valleys. The primary distributary channels have stronger hydrodynamic forces with higher proportions of coarse sand deposits than the secondary distributary channels. Therefore, lithofacies paleogeography mapping is controlled by the geomorphology, valley locations, and the migration of channels. We reconstructed the paleogeomorphology and valley systems that existed prior to the deposition of the Xujiahe Formation. Following this, rock-electro identification model for coarse skeletal sand bodies was constructed based on coring data. The results suggest that skeletal sand bodies in primary distributary channels occur mainly in the valleys and low-lying areas,whereas secondary distributary channels and fine deposits generally occur in the highland areas. The thickness distribution of skeletal sand bodies and lithofacies paleogeography map indicate a positive correlation in primary distributary channels and reservoir thickness. A significant correlation exists between different sedimentary facies and petrophysical properties. In addition, the degree of reservoir development in different sedimentary facies indicates that the mapping method reliably predicts the distribution of sweet spots. The application and understanding of the mapping method provide a reference for exploring tight sandstone reservoirs on a regional basis. | Yuan Zhong Lu Zhou Xiucheng Tan Chengbo Lian Hong Liu Jijia Liao Guang Hu Mingjie Liu Jian Cao | 2017 | Geoscience Frontiers2017，8，5： | 9 |
| 2 | Occurrences and Formation Mechanisms of Botryoidai Structures from the Sinian Dengying Formation,Sichuan Basin,China显示文摘Objective This study aims to characterize the occurrences and interior structural features of botryoidal structures from the Sinian Dengying Formation in the Sichuan Basin of Southwestern China,and to shed light on their formation mechanism.Method Based on the observation of outcrop and drilling cores,this study carried out polarizing microscope analyses and cathodoluminescence microscope analyses with respect to the botryoidal structures. | LIAN Chengbo QU Fang TAN Xiucheng LI Ling JIN Mindong ZENG Wei REN Quanxiong HU Guang LIU Hong | 2016 | Acta Geologica Sinica(English Edition)2016，90，1： | 5 |
| 3 | Gut Microbiome Variation Along A Lifestyle Gradient Reveals Threats Faced by Asian Elephants显示文摘The gut microbiome is closely related to host nutrition and health.However,the relationships between gut microorganisms and host lifestyle are not well characterized.In the absence of confounding geographic variation,we defined clear patterns of variation in the gut microbiomes of Asian elephants(AEs)in the Wild Elephant Valley,Xishuangbanna,China,along a lifestyle gradient(completely captive,semicaptive,semiwild,and completely wild).A phylogenetic analysis using the 16S rRNA gene sequences highlighted that the microbial diversity decreased as the degree of captivity increased.Furthermore,the results showed that the bacterial taxon WCHB1-41_c was substantially affected by lifestyle variations.qRT-PCR analysis revealed a paucity of genes related to butyrate production in the gut microbiome of AEs with a completely wild lifestyle,which may be due to the increased unfavorable environmental factors.Overall,these results demonstrate the distinct gut microbiome characteristics among AEs with a gradient of lifestyles and provide a basis for designing strategies to improve the well-being or conservation of this important animal species. | Chengbo Zhang Zhenghan Lian Bo Xu Qingzhong Shen Mingwei Bao Zunxi Huang Hongchen Jiang Wenjun Li | 2023 | Genomics, Proteomics & Bioinformatics2023，21，1： | 0 |
| 4 | Review and prospect on the botryoidal structures from the Sinian Dengying Formation,Sichuan Basin,China显示文摘Fabric of carbonate rock is the important foundation and one of main research contents for study on carbonate sedimentology,and has always been the attention of the academic circles.Botryoidal structures from the Sinian Dengying Formation in the Sichuan Basin is a kind of special carbonate fabric,the fabric is named after the shape of a grape.In this paper,from four aspects of the research status,the definition of the botryoidal structures and the related terms,the construction characteristics of the botryoidal structures,the component of the botryoidal structures,geochemical characteristics and the genesis of the botryoidal structures are reviewed.It points out the current research issues of botryoidal structures from the Sinian Dengying Formation in the Sichuan Basin,and put forward that future research should focus on the accurate analysis of its internal construction,precipitation mechanism of the major components,and the construction mechanism of botryoidal structures. | Chengbo Lian Guanxiong Ren Fang Qu Xiucheng Tan Ling Li Wei Zeng Guang Hu Hong Liu | 2017 | Petroleum2017，3，2： | 0 |
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