Modeling and Evaluation of Rock Properties Based on Integrated Logging While Drilling with the Use of Statistical Methods and Fuzzy Logic

Efendiyev, G. M.; Mammadov, P.Z.; Piriverdiyev, I. A.

doi:10.1007/978-3-030-35249-3_64

Cited by 1 publication

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“…In nature, the density, resistivity and/or porosity of normally compacted rocks and burial depth have an exponential relationship (Mkpese, 2018). According to a complex of various features, by analyzing their measurements with depth, it is possible to identify homogeneous intervals, in which zones of abnormally high formation pressures are clearly distinguished (Efendiyev et al, 2019;Efendiyev et al, 2021). Plotting this relationship gives a very smooth curve called the normal compaction curve.…”

Section: Methods Used To Predict Abnormally High Pore Pressuresmentioning

confidence: 99%

Specific features of shale compaction in the Azerbaijan sector of the South Caspian Basin

Suleymanov¹,

Yusifov²,

Bunyatov³

et al. 2022

ANAS Transactions

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The South Caspian Basin (SCB) covering a small area experienced intensive subsidence in the lower Pliocene and was isolated from the world ocean. The structures of the Baku Archipelago have one of the world's most complex geological conditions for drilling, with rocks in the near well-bore area squeezed into the wellbore (the so-called well filling) when drilling through shales in the productive series, which account for as much as 90% of the Archipelago. Well filling leads to problems and accidents and triggers drilling mud blowouts and water/gas kicks, which often results in well abandonment.The primary cause for well filling is abnormally high pore pressures in the cross-section of the structures, with gradients close to geostatic pressure gradients; such pressures are typical of thick shale strata. A study of shales found that shale porosity remained exceptionally high at great depths due to delays in shale compaction, the shortage of de-stressed zones and high rates of sediment subsidence.Based on the core studies and measurements while drilling, various parameters were analyzed, including the density and porosity of shale samples taken in different years while drilling on the Baku Archipelago, in particular on the Umid structure. The compaction curve was plotted, and a potential zone of abnormally high pore pressures was delineated.

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Section: Methods Used To Predict Abnormally High Pore Pressuresmentioning

confidence: 99%