Simulation of acoustic impedance images by stochastic inversion of post-stack seismic reflection amplitudes and well data

Alves, Fernando Donizete; Almeida, José António de; Silva, Ana Paula

doi:10.1016/j.petrol.2014.06.006

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…Inversi dapat dipahami sebagai proses pembuatan model impedansi akustik untuk mendapatkan nilai besaran suatu sifat batuan pada arah lateral yang terikat kuat dengan sifat impedansi akustik (Atarita et al, 2017) [2]. Post-stack inversion dapat dipahami sebagai proses inversi yang dilakukan terhadap data seismik post-stack (Alves et al, 2014) [1]. Proses inversi yang menggunakan data seismik post-stack hanya dapat menghasilkan satu model impedansi saja, yaitu impedansi dari gelombang primer atau P-wave impedance (Alves et al, 2014) [1].…”

Section: Metodelogi Penelitianunclassified

“…Post-stack inversion dapat dipahami sebagai proses inversi yang dilakukan terhadap data seismik post-stack (Alves et al, 2014) [1]. Proses inversi yang menggunakan data seismik post-stack hanya dapat menghasilkan satu model impedansi saja, yaitu impedansi dari gelombang primer atau P-wave impedance (Alves et al, 2014) [1].…”

Section: Metodelogi Penelitianunclassified

“…Pembuatan model inversi dimulai dari membuat model impedansi pada data seismik dan data sumur. Karena data seismik yang digunakan adalah data post-stack seismic, maka menurut Alves, et al (2014) [1], impedansi dapat dirumuskan sebagai persamaan :…”

Section: Metodelogi Penelitianunclassified

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Analisis Log Toc Passey Dan Penyebaran Serpih Piniya Menggunakan Metode Seismik Inversi, Cekungan Akimeugah

2019

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RingkasanCekungan Akimeugah memiliki potensi hidrokarbon dengan adanya beberapa rembesan minyak dan gas bumi disekitar daerah penelitian. Hal ini mengindikasikan adanya sistem minyak dan gas bumi yang bekerja pada daerah tersebut. Serpih Piniya merupakan salah satu formasi yang berpotensi menjadi batuan induk sekaligus batuan reservoar yang baik. Batuan induk yang mengandung hidrokarbon ditentukan oleh kuantitas material organik (Total Organic Carbon). Untuk itu, perlu diketahui kuantitas material organik (TOC) serta penyebaran dari Serpih Piniya.Serpih Piniya disusun oleh litologi dominan serpih dengan sisipan batulanau dan batupasir. Formasi ini diendapkan pada lingkungan laut dangkal (shallow marine) dengan asosiasi fasies offshore transition hingga offshore. Jumlah kuantitas material organik (TOC) dari data sampel sebesar 0.552 wt% termasuk ke dalam kategori batuan induk yang bersifat cukup (fair ). Tipe kerogen Serpih Piniya adalah tipe II -III yang dapat menghasilkan hidrokarbon minyak dan gas. Litofasies serpih yang dapat menghasilkan hidrokarbon adalah organic shale. Interval organic shale terdapat pada sumur AK-6 sebanyak 46 zona dan sumur AK-9 sebanyak 34 zona. Perhitungan TOC Passey menghasilkan nilai TOC rata-rata sebesar 0.527 wt% menandakan Serpih Piniya berada pada kategori batuan induk yang bersifat cukup.Penyebaran nilai TOC menggunakan seismik inversi untuk mengetahui model geologi bawah permukaan. Penyebaran nilai TOC tinggi ditandai dengan nilai impedansi akustik yang rendah, area tersebut terletak pada bagian rendahan daerah penelitian. Area sweet spot secara umum berada disekitar sumur AK-2, area tersebut memiliki nilai TOC berkisar 0.552 wt% dengan ketebalan Serpih Piniya kurang lebih sebesar 1200 m.Kata Kunci : TOC Passey, Seismik Inversi, Serpih Piniya. AbstractAkimeugah Basin has hydrocarbon potential with some oil and gas seepages around the research area. This indicates the existence of an petroleum system that works in this area. Piniya Shale is one of the formations which has the potential to become a source rock as well as good reservoir rock. Source rock that containing hydrocarbons was determined by the Total Organic Carbon. For that reasons, it is necessary to know about quantity of Total Organic Carbon and the distribution of Piniya Shale.Piniya Shale are composed by the dominant of shale with intercalation of siltstone and sandstone. This formation is deposited in shallow marine with offshore transition and offshore as facieas associations. Total organic carbon from sample data is 0.552 wt%, its meaning Piniya Shale in the category fair as a source rock. Kerogen type Piniya Shale are type II -III which can produce oil and gas hydrocarbon. Litofacies of shale that can produce hydrocarbons are organic shale. The organic shale interval was found in the AK-6 wells as 46 zones and AK-9 wells as 34 zones. TOC Passey calculation produce TOC value of 0.527 wt% that indicates Piniya Shale in the category fair as a source rock Distribution of TOC Passey using seismic inversion to determi...

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Section: Metodelogi Penelitianunclassified

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Analisis Log Toc Passey Dan Penyebaran Serpih Piniya Menggunakan Metode Seismik Inversi, Cekungan Akimeugah

2019

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“…Accurate interpretation of low-resolution seismic data is one of the main factors of successful hydrocarbon exploration programs (Bacon et al, 2007). However, indirect measurements of seismic data and mostly incorrect prediction of subsurface geology are the fundamental potential problems in seismic interpretation (Alves et al, 2014;May and Hron, 1978). A method to calibrate and ground-truth seismic analysis is to construct synthetic seismic models resulting from a predefined geological framework and associated petrophysical data obtained from outcrops.…”

Section: Introductionmentioning

confidence: 99%

Synthetic seismic model of a Permian biosiliceous carbonate – carbonate depositional system (Spitsbergen, Svalbard Archipelago)

Jafarian

Jong

Kleipool

et al. 2018

Marine and Petroleum Geology

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The non-unique correspondence between seismic and subsurface geology is a fundamental problem when interpreting seismic data sets. Synthetic seismic models of outcrop analogs are commonly constructed to cover the gap between the small-scale outcrop observations and low-resolution seismic data. The Permian biosiliceous carbonatecarbonate sediments on Spitsbergen are characterized by a wide variability in lithologies and microfacies determining the petrophysical properties (e.g., porosity, acoustic properties) that consequently complicate seismic interpretation. This study uses 1D and 2D synthetic seismic modelling techniques (at different resolutions) to gain an understanding of how seismic reflectors are expressed with respect to the sediment distribution, aiming to facilitate real seismic interpretation. In the study area, nine microfacies were defined that were used to produce a geological model displaying small-scale microfacies variations within a well-defined sequence stratigraphic framework. Laboratory derived petrophysical properties (Vp, ρBulk and AI) were assigned to each predefined microfacies body in the geological models in order to construct acoustic impedance models that were used to produce synthetic seismograms. The appearance of the seismic reflectors in the synthetic seismic profiles is primarily controlled by changes in mineral composition and link to spatial microfacies distributions within the depositional sequences. Differences in acoustic impedance and the origin of synthetic seismic reflections within a single microfacies type are mainly caused by porosity contrasts (varying between 5 and 20%) and diagenetic modifications such as chertification and cementation. This detailed information cannot be derived from the low-frequency seismograms (25-100 Hz) resulting in changes in seismic expression when seismic resolution diminishes. Comparison with time equivalent, real and synthetic seismic data of the Finnmark Platform reveals similarities with the synthetic seismic reflection patterns of Spitsbergen. In both areas, the pronounced seismic traces follow abrupt microfacies transitions, which are coherent with cycle boundaries and timelines.

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Multi-layered ordovician paleokarst reservoir detection and spatial delineation: A case study in the Tahe Oilfield, Tarim Basin, Western China

Tian

Jin

et al. 2016

Marine and Petroleum Geology

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Simulation of acoustic impedance images by stochastic inversion of post-stack seismic reflection amplitudes and well data

Cited by 8 publications

References 16 publications

Analisis Log Toc Passey Dan Penyebaran Serpih Piniya Menggunakan Metode Seismik Inversi, Cekungan Akimeugah

Analisis Log Toc Passey Dan Penyebaran Serpih Piniya Menggunakan Metode Seismik Inversi, Cekungan Akimeugah

Synthetic seismic model of a Permian biosiliceous carbonate – carbonate depositional system (Spitsbergen, Svalbard Archipelago)

Multi-layered ordovician paleokarst reservoir detection and spatial delineation: A case study in the Tahe Oilfield, Tarim Basin, Western China

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