self potential
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Geophysics ◽  
2022 ◽  
pp. 1-79
Author(s):  
Mutlaq Alarouj ◽  
Matthew David Jackson

Monitoring water movement toward production wells through downhole measurements of self-potential (SP) was a promising new technology. However, there were uncertainties about its applicability in heterogeneous, multilayered reservoirs. Using numerical modeling, we investigated the likely magnitude and behavior of SP during oil production supported by water injection in two different models of such reservoirs. We found that the magnitude of the SP signal that would be measured along a production well increased as water approached the well, exceeding an assumed noise level of 0.1 mV before water breakthrough. We also found that, in the reservoir models tested, the maximum value of SP at the well skewed toward the fastest waterfront before water breakthrough. The trend of SP increasing at the well with time, together with the shape of the SP profile, were the prime indicators used to investigate water movement. In the reservoir models tested, before water breakthrough the fastest approaching waterfront could be detected approximately 20 m away from the well. However, subsequent waterfronts approaching the well in other layers could not be detected before breakthrough. The effect of these later waterfronts on the SP profile at the well was only detectable at breakthrough. We attributed this to the fact that the SP generated in these layers is masked by the high SP created by the fastest waterfront. Our findings emphasized the importance of an enhanced understanding of reservoir geology and rock electrical properties for better prediction and interpretation of SP.


Author(s):  
Ahmed A. Radwan ◽  
Bassem S. Nabawy

AbstractIn this study, it is aimed to characterize the Early pliocene sandstone (EP-SD) and the Late Miocene-Early Pliocene Mangaa sandstone reservoirs and the efficiency of their sealing cap rocks using the petrographical and petrophysical data of these sandstone zones in northern Taranaki basin, New Zealand. The prospective potential reservoirs were studied using impregnated thin sections, XRD data analysis, and well log data (self-potential, gamma-ray, sonic, density, neutron, shallow\deep resistivity and PEF) to characterize the reservoir zones, in addition to Mercury intrusion capillary pressure data (MICP) to check the efficiency of some potential seals. The EP-SD and the Mangaa sandstone units are typically poorly consolidated very fine sandstone to siltstone, with porosities averaging 25%. The sands are composed of quartz (38.3–57.4%), with common feldspars (9.9–15.2% plagioclase, and 2.7–6.3% K-feldspars) and up to 31.8% mica. In Albacore-1 well to the north of the Taranaki Basin, the Mangaa formation includes three separate for each of the EP-SD zones (EP-SD1, EP-SD2, and EP-SD3), and the Mangaa sequence (Mangaa-0, Mangaa-1, and Mangaa-2). The thin section studies indicate that, the studied samples are grouped into greywackes, arenites and siltstone microfacies with much lithic fragments and feldspars, sometimes with glauconite pellets. From the XRD data, it is achieved that the mineral composition is dominated by quartz, mica/illite, feldspars, and chlorite. The petrophysical investigation revealed absence of pay zones in the EP-SD zones, and presence of thin pay zone with net thickness 5.79 m and hydrocarbon saturation of about 25.6%. The effective porosities vary between 23.6 and 27.7%, while the shale volume lies between 12.3 and 16.9%. Although the shale content is relatively low, the relatively high API (50–112 API of average 75 API) is contributed by the relatively high K-feldspar content and intercalations with thin siltstone and muddy siltstone beds. Sealing units include the intra-formational seals within the Mangaa sequence, mudstones and fine grained units overlying the Mangaa and further intra-formational mudstones, within the shallower EP-SD units. The efficiency of these seals indicates the capability to trap 16.4–40.6 m gas or 17.4–43.0 m oil which is relatively low in correlation with their efficiency in the central parts of the Taranaki Basin Overlying the primary seals, mudstones of the Giant Foresets Formation provide additional regional seal.


2021 ◽  
pp. 1-13
Author(s):  
Alex Priestley ◽  
Bernd Kulessa ◽  
Richard Essery ◽  
Yves Lejeune ◽  
Erwan Le Gac ◽  
...  

Abstract To understand snow structure and snowmelt timing, information about flows of liquid water within the snowpack is essential. Models can make predictions using explicit representations of physical processes, or through parameterization, but it is difficult to verify simulations. In situ observations generally measure bulk quantities. Where internal snowpack measurements are made, they tend to be destructive and unsuitable for continuous monitoring. Here, we present a novel method for in situ monitoring of water flow in seasonal snow using the electrical self-potential (SP) geophysical method. A prototype geophysical array was installed at Col de Porte (France) in October 2018. Snow hydrological and meteorological observations were also collected. Results for two periods of hydrological interest during winter 2018–19 (a marked period of diurnal melting and refreezing, and a rain-on-snow event) show that the electrical SP method is sensitive to internal water flow. Water flow was detected by SP signals before it was measured in conventional snowmelt lysimeters at the base of the snowpack. This initial feasibility study shows the utility of the SP method as a non-destructive snow sensor. Future development should include combining SP measurements with a high-resolution snow physics model to improve prediction of melt timing.


2021 ◽  
Vol 5 (1) ◽  
pp. 89
Author(s):  
Tania Intan ◽  
Vincentia Tri Handayani ◽  
Nurul Hikmayaty Saefullah

ABSTRAKMengamati perkembangan teknologi digital pada masyarakat saat ini, terungkap adanya peningkatan partisipasi aktif masyarakat dalam kegiatan literasi digital termasuk pada pemanfaatan media digital dan internet sebagai akses informasi dan pelayanan publik. Untuk menjadi literat digital yang mampu memproses, memahami, dan menyeleksi berbagai informasi dibutuhkan kecakapan tersendiri. Dalam upaya mencapai kompetensi tersebut, tim pengabdian pada masyarakat dari Universitas Padjadjaran bekerja sama dengan mahasiswa KKN sesi Juli - Agustus 2021 menyelenggarakan sejumlah kegiatan yang bertujuan untuk (1) menginformasikan cara pemanfaatan media sosial sebagai wadah yang berdaya guna dan (2) mengedukasi pembuatan konten yang berkualitas dan tepat sasaran di media sosial. Publik primer yang disasar adalah mereka yang berusia produktif 17-26 tahun, dan publik sekunder yang terdiri dari masyarakat umum pengguna media sosial. Tim PPM mengajak mitra terkait yang memiliki program tanggung jawab sosial perusahaan dan kepedulian terhadap literasi digital, yaitu Telkomsel untuk bersama-sama menciptakan ekosistem digital yang positif di Indonesia. Kegiatan dilaksanakan dengan metode sosialisasi, edukasi, dan diskusi, melalui Kampanye Sosial dan Webinar Cakap Bermedia Digital untuk Pengembangan Potensi Diri. Selain adanya tambahan pengetahuan dan keterampilan pada publik sasaran, indikator keberhasilan yang ditunjukkan oleh kegiatan pengabdian masyarakat ini adalah jumlah peserta kampanye dan webinar yang melebihi target, yaitu mencapai 114 orang. Kata kunci: generasi kritis; media sosial; literasi digital; pengembangan potensi diri. ABSTRACTObserving the development of digital technology in today's society, it was revealed that there was an increase in the active participation of the community in digital literacy activities, including the use of digital media and the internet as access to information and public services. To become a digital literate who can process, understand, and select various information requires its skills. To achieve these competencies, the community service team from Padjadjaran University in collaboration with KKN students for the July - August 2021 session held some activities aimed at (1) informing how to use social media as an efficient forum and (2) educating the creation of quality content. and right on target on social media. The primary public targeted are those in the productive age of 17-26 years, and the secondary public consists of the general public who use social media. The PPM team invites related partners who have corporate social responsibility programs and concern for digital literacy, namely Telkomsel, to jointly create a positive digital ecosystem in Indonesia. Activities are carried out using socialization, education, and discussion methods, through Social Campaigns and Webinar Digital Media for Self-Potential Development. In addition to the additional knowledge and skills of the target public, an indicator of success shown by this community service activity is the number of campaign and webinar participants that exceeded the target, which reached 114 people. Keywords: critical generation; social media; digital literacy; self potential development.


2021 ◽  
Vol 35 (1) ◽  
pp. 51-61
Author(s):  
Peter Gerginov

Hydrogeological conditions largely depend on the permeability of the geological environment. In areas with complex geological and tectonic conditions, the detection of hydraulic heterogeneity of the rocks and determination of groundwater-rich zones is a challenge for hydrogeological practice. The aim of the study is to analyze the geological and tectonic prerequisites for hydraulic heterogeneity of the sediments for the Gotse Delchev valley (Southwestern Bulgaria), which predetermine the degree of their water productivity. In order to obtain more precise data for specific sites, a geophysical survey was conducted. The Self-Potential method was chosen, which is one of the most commonly used techniques for applications for hydrogeological purposes. The results of the geophysical survey carried out in selected sites allowed to locate groundwater-rich zones, to establish the depth of occurrence of hard low permeable rocks, as well as to confirm the presence of faults.


Author(s):  
Putu Ersa Rahayu Dewi ◽  
I Nyoman Suadnyana ◽  
Luh Putu Widya Fitriani

<p class="p2">Every human individual is always in the process of forming his character, because a character is formed starting from the family, school, and environment. Formally, the formation of human character is formed consciously and systematically in developing self-potential. Tenganan Pegringsingan Traditional Village has a religious tradition which is considered as a place for internalizing character values which is devoted as a form of cultural resilience in the Tenganan Pegringsingan Traditional Village, which is held annually and every three years for <em>muran </em>which is marked with <em>sasih kapat </em>twice in one year which is right on <em>sasih kalima </em>according to the calendar system of the Tenganan Pegringsingan Traditional Village is called <em>Ngusaba Sambah</em>. The results of this scientific paper using a qualitative research with an ethnographic approach.<span class="Apple-converted-space"> </span></p>


2021 ◽  
pp. 869
Author(s):  
Henny Henny ◽  
Olivia Dorothea Husin

Education for the younger generation is very important in increasing knowledge, creating creativity, and developing self-potential. Therefore, the Mahkota Kasih Insani Learning House in addition to funding student's schools also collaborates with external parties to provide initial knowledge for students from the foster children of the MahkotaKasih Insani Learning House before facing learning activities at school. The collaboration is carried out by inviting lecturers and students of the Accounting Department, Faculty of Economics and Business, UniversitasTarumanagara, Jakarta to share knowledge in the field of accounting in community service activities. The purpose of this activity is to provide training on the introduction of the basics of accounting for students of the Mahkota Kasih Insani Learning House. The activity will be carried out on Saturday, July 3, 2021, offline with strict health protocols. This activity uses training methods regarding the introduction of accounting basics, accounting structures, basic accounting equations, and financial reports, as well as practice exercises about accounting basics. Based on the results of the activity evaluation, it can be concluded that community service activities run smoothly and give a good general impression for students because students can better recognize and understand the basics of accounting that are useful in dealing with learning activities in schools in the field of accounting.Pendidikan bagi generasi muda sangat penting dalam menambah pengetahuan, menciptakan kreativitas, dan mengembangkan potensi diri. Oleh karena itu, Rumah Belajar Mahkota Kasih Insani selain membiayai sekolah siswa juga bekerjasama dengan pihak eksternal memberikan pengetahuan awal bagi siswa dari anak asuh Rumah Belajar Mahkota Kasih Insani.sebelum menghadapi kegiatan belajar di sekolah. Kerjasama yang dilakukan dengan cara mengundang dosen dan mahasiswa Jurusan Akuntansi Fakultas Ekonomi dan Bisnis Universitas TarumanagaraJakarta untuk berbagi ilmu dibidang akuntansi dalam kegiatan pengabdian kepada masyarakat. Tujuan dari kegiatan tersebut adalah memberikan pelatihan pengenalan dasar-dasar akuntansi bagi siswa Rumah Belajar Mahkota Kasih Insani. Pelaksanaan kegiatan dilakukan pada hari Sabtu, 3 Juli 2021 secara luring dengan protokol kesahatan yang ketat. Kegiatan tersebut menggunakan metode pelatihan mengenai pengenalan dasar-dasar akuntansi, struktur akuntansi, persamaan dasar akuntansi, dan laporan keuangan, serta praktek latihan soal dasar-dasar akuntansi. Berdasarkan hasil evaluasi kegiatan, maka dapat disimpulkan kegiatan pengabdian kepada masyarakat berjalan dengan lancar dan memberikan kesan umum yang baik bagi siswa dikarenakan siswa dapat lebih mengenal dan memahami dasar-dasar akuntansi yang bermanfaat dalam menghadapi kegiatan belajar di sekolah dalam bidang akuntansi.


Author(s):  
O. V. Pavlovsky ◽  
V. I. Dorozhinsky ◽  
S. D. Mostovoy

In this paper, we consider a model of an artificial neural network based on quantum-mechanical particles in [Formula: see text] potential. These particles play the role of neurons in our model. To simulate such a quantum-mechanical system, the Monte Carlo integration method is used. A form of the self-potential of a particle as well as two interaction potentials (exciting and inhibiting) are proposed. Examples of simplest logical elements (such as AND, OR and NOT) are shown. Further, we show an implementation of the simplest convolutional network in framework of our model.


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