Topic
Effective porosity
About: Effective porosity is a research topic. Over the lifetime, 1199 publications have been published within this topic receiving 26511 citations.
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TL;DR: In this article, a fully connected neural network was trained and tested on data for lithofacies prediction in wells with no core data and borehole image, which can be applied on wider scale in other uncored wells.
25 citations
TL;DR: In this paper, the kerosene low-field NMR signal and porosity relationship was established and demonstrated for lignites from the Lower Cretaceous Saihantala Formation in the Shengli coalbed reservoirs in the Erlian Basin of Inner Mongolia, China.
24 citations
TL;DR: Coupled bio-chemo-hydraulic modelling was developed to enhance the understanding of the coupled processes involved in MICP and to predict the MICP performance in permeability reduction.
24 citations
TL;DR: In this paper, the authors demonstrate that significant secondary porosity can also develop by dissolution of quartz framework grains if the rocks are exposed to alkaline pore fluids during deep burial and/or uplift.
Abstract: An understanding of the nature and origin of porosity in sandstones is crucial to the evaluation of their potential as hydrocarbon reservoirs. Primary porosity is normally destroyed by cementation, compaction and pressure solution during burial, but it has recently been recognized that significant secondary porosity can develop at depth1–3. This discovery has been called “the most significant advance in the study of clastic diagenesis in the past decade”4. Several genetic types of secondary porosity have been identified ; these include porosity formed by: (1) fracturing; (2) shrinkage; (3) dissolution of sedimentary grains and matrix; (4) dissolution of authigenic cements; and (5) dissolution of authigenic replacive minerals5. Formation of secondary porosity by framework grain dissolution has been thought mainly to involve decomposition of feldspars and lithic grains6,7.We demonstrate here that significant secondary porosity can also develop by dissolution of quartz framework grains if the rocks are exposed to alkaline pore fluids during deep burial and/or uplift.
24 citations
TL;DR: In this article, the authors explored the feasibility of using total and effective porosities as estimators of crack-initiation stress of brittle crystalline rock materials under uniaxial compression.
Abstract: Crack-initiation stress of a rock under compression is the stress level that marks the initiation of the rock microfracturing process or in other words, the onset of new damage to the rock. This paper proposed a simple methodology with justifications to explore the feasibility of using total and effective porosities as estimators of crack-initiation stress of brittle crystalline rock materials under uniaxial compression. The validity/applicability of the proposed method was examined by an experimental study of granitic materials from Malanjkhand, Madhya Pradesh. It was found that effective porosity depicts better correlation with crack-initiation stress than with uniaxial compressive strength of the granitic materials. On the other hand, total porosity does not show any perceptible correlation with uniaxial compressive strength and crack-initiation stress. Plausible reasons for the nature of the obtained results were also explained in view of rock failure process under compression. It is concluded that following the proposed method, effective porosity can be used as a physical index to obtain a quick estimate of crack-initiation stress of the investigated rocks empirically.
24 citations