NMR is a popular logging technique used to estimate pore size information, formation permeability, wettability and irreducible water saturation. Quantitative interpretation of NMR data is based on a set of fundamental assumptions (e.g., pore isolation and fast diffusion). These assumptions establish the quantitative link between NMR response and petrophysical predictions. While there is a need ...

An increase in intracellular Ca2+ concentration ([Ca2+]) and morphological were simultaneously observed by epifluorescence and differential interference contrast (DIC) microscopy during fertilization of the sand dollar, Clypeaster japonicus. [Ca2+], which was detected by a Ca2+ indicator, Fluo-3, initially increased just beneath the sperm-attached site on the egg surface 8.6 sec after attachmen...

We summarize information concerning Recent and Pleistocene-Holocene Uruguayan sand dollars (Mellitidae), as well as Miocene taxa (Monophorasteridae). Recent and Pleistocene-Holocene species (Encope emarginata, Mellita quinquiesperforata, and Leodia sexisperforata) are at their southernmost limits of distribution, with only E. emarginata recorded further south than Uruguay. Lower temperatures to...

Many larvae and other plankton have complex and variable morphologies of unknown functional significance. We experimentally and theoretically investigated the functional consequences of the complex morphologies of larval sand dollars, Dendraster excentricus (Eschscholtz), for hydrodynamic interactions between swimming and turbulent water motion. Vertical shearing flows (horizontal gradients of ...

Abstract An approach for post-frac production profiling has been presented in this study by integrating a fracture model with reservoir simulation well drilled tight sand of Lower Indus Basin Pakistan. The integrated couples the output from growth to effectively predict behavior fractured reservoir. Optimization hydraulic fracturing was done efficiently through work study. used perform various ...

The conventional approach in reservoir characterization uses an extrapolation of petrophysical properties calculated from well logs determining the entire field volume. This technique fails to acknowledge/ factor heterogeneity a reservoir, and consequently leads errors capacity quantification. research work employs deterministic seismic inversion each sand. First, sand was identified intervals ...

Abstract Sand production is the most common problem after hydraulic fracturing treatment. This particular prominent in sandstone reservoirs. For Jinqiu gas reservoir of Sichuan Basin China, average sand 103 tons, and rate 2.36% through statistics 12 wells. The will seriously damage downhole equipment as well ground facilities. In this study, based on analysis source, it clear that mainly 70/140...

The features of bad flow unit continuity and multiple layers emphesize the importance of a well pattern design for the development of a fluvial-delta reservoir. It is proposed a method to predict well pattern connectivity (WPC) based on the exploration and evaluation of wells. Moreover, the method helps evaluate the risk of well placement. This study initially establishes the parameters for cha...

The acoustic logging method is the most commonly used to qualify a cement job. It can be run several hours or days after placement and evaluates quality of bond (acoustic coupling) between casing, formation. measures attenuation sound signal as it propagates through formation returns sensor. This technique will help spot free pipe, partially bonded fully pipe. aim this paper analyses logs data ...