Buxoro–Xiva neft-gaz mintaqasidagi murakkab tuzilishli karbonat kollektorlarning petrofizik xossalarini asoslash: Alan koni misolida

Annotatsiya

This study investigates the petrophysical properties of complex carbonate reservoirs in the Alan field, Chorjou step, Bukhara-Khiva oil and gas region, to support spatial distribution and reserve estimation. It aims to identify factors driving the "apparent saturation" effect and low-resistivity pay zones in the Jurassic carbonate sequence (horizons XV-HP, XV-P, XV-ΠΡ, and XV-a), using well logging data (Gamma Ray, Resistivity, Neutron, Sonic) and core analysis linking porosity, permeability, clay content, and fracturing. Results reveal extreme heterogeneity and a bimodal porosity system. Despite relatively uniform total porosity (12–18%) across horizons, permeability and water saturation differ drastically: the upper reef horizons (XV-HP, XV-P) show high permeability (285–400 mD) and low water saturation (11–13%) from vuggy, fractured structures, while the lower sub-reef and basal horizons show reduced permeability (~11.6 mD) and saturation up to 35%. This disparity stems from diagenetic clay minerals (montmorillonite and kaolinite) and isolated micropores, which raise capillary forces and cation exchange capacity, suppressing resistivity and creating an apparent high-saturation effect. Conventional interpretation is insufficient for such systems; integrating Digital Rock Physics and artificial intelligence is recommended to differentiate low-resistivity pay zones, reduce geological uncertainty, and optimize field development, thereby preventing early water breakthrough and maximizing recovery efficiency.

Maqola bilan e’lon qilingan ingliz tilidagi annotatsiya (CC BY 4.0). Mualliflar annotatsiyasi CC BY 4.0 litsenziyasi asosida keltirilgan. Annotatsiya ingliz tilida berilgan.

Sodda qilib aytganda

Neft va gaz konlari geologiyasi va qidiruvi institutidan (IGIRNIGM) O. Qarshiyev, I. Xolmurodov va O. Bolibekov Buxoro–Xiva neft-gaz mintaqasining Chorjo‘y pog‘onasidagi Alan konining murakkab karbonat kollektorlari petrofizik xossalarini o‘rganadi; maqsad — kollektorlarni xaritalash va zaxiralarni hisoblashga asos yaratish. Mualliflar yura karbonat kesimining to‘rt gorizontida — XV-HP, XV-P, XV-ΠΡ va XV-a — «soxta to‘yinganlik» effekti va past qarshilikli mahsuldor zonalar sabablarini izlaydi. Buning uchun gamma, qarshilik, neytron va akustik karotaj ma’lumotlari hamda g‘ovaklik, o‘tkazuvchanlik, gil miqdori va yoriqlikni bog‘laydigan kern tahlillaridan foydalanilgan.

Kollektorlar juda bir jinsli emas, g‘ovak tizimi ikki modali. Umumiy g‘ovaklik gorizontlar bo‘yicha deyarli bir xil — 12–18%, ammo o‘tkazuvchanlik va suvga to‘yinganlik keskin farq qiladi. Yuqori rif gorizontlari XV-HP va XV-P kovakli, yoriqli jinslardan iborat: o‘tkazuvchanlik 285–400 mD, suvga to‘yinganlik 11–13%. Pastki rifosti va asos gorizontlarida o‘tkazuvchanlik taxminan 11,6 mD, suvga to‘yinganlik 35% gacha. Diagenetik gil minerallari — montmorillonit va kaolinit — hamda alohida mikrog‘ovaklar kapillyar kuchlarni va kation almashinuv sig‘imini oshiradi; bu qarshilikni pasaytirib, jinsni aslidagidan ko‘ra suvga to‘yinganroq qilib ko‘rsatadi.

Mualliflar xulosasiga ko‘ra, bunday jinslar uchun an’anaviy karotaj talqini yetarli emas. Ular past qarshilikli mahsuldor zonalarni ajratish, geologik noaniqlikni kamaytirish, suvning erta yorib kirishining oldini olish va qazib olishni oshirish uchun raqamli jins fizikasi va sun’iy intellektdan foydalanishni tavsiya qiladi. Buxoro va Chorjo‘y pog‘onalarining tuzilishi va kollektorlari Ulmishek (2004) ishida ham tavsiflangan.

Iqtibos namunasi

O. Karshiyev, I. Holmurodov and O. Bolibekov (2026). Substantiation of the petrophysical properties of complex-structured carbonate reservoirs in the Bukhara-Khiva oil and gas region: A case study of the Alan field. E3S Web of Conferences, vol. 745, 06001. https://doi.org/10.1051/e3sconf/202674506001