The role of heterogeneity controls in shaping the Asmari Formation reservoirs in the Zagros region, Iran: insights for regional characterization

Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Various depositional and post-depositional factors interact to shape a reservoir, typically causing heterogenies in reservoir properties on different scales. This study investigates depositional and diagenetic factors controlling reservoir properties of the Asmari Formation as the most prolific reservoir rock in Iran. Data from six surface and 12 subsurface sections show that both primary and secondary factors governed reservoir quality. Lithology is the principal primary control, with major differences between siliciclastics and carbonates. Other primary controls include rock texture, facies, and depositional setting. Dolomitization, dissolution, and cementation are the main diagenetic factors that modify the original rock fabric. Dolomitization improved reservoir quality. Early diagenetic dissolution also enhanced porosity. However, the created spaces are separated vuggy and moldic pores with no effect on permeability. Cementation and compaction are major porosity-occluding processes. Anhydrite cementation degraded reservoir quality of oolites, one of the best productive facies of Asmari. Results show that tectonics, paleo-climate, and sea-level changes were allogenic controls on reservoir configuration. Lithology variations, as a principal control on reservoir quality, resulted from tectonic movements alongside sea-level oscillations. The diagenetic path—specifically dolomitization, dissolution, and cementation—was controlled by paleo-climate and sea-level changes. Hypersaline conditions prevailed during and after deposition, with major impacts on the reservoir quality (pervasive dolomitization and dissolution), were the consequence of combined paleo-climate and sea-level effects. Regional syn- and post-depositional tectonics created widespread fractured reservoirs with higher production rates than unfractured counterparts. The results of this study can assist in regional characterization of the Asmari reservoir throughout the Zagros area.
Language:
English
Pages:
385 to 414
magiran.com/p2648570  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 1,390,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
دسترسی سراسری کاربران دانشگاه پیام نور!
اعضای هیئت علمی و دانشجویان دانشگاه پیام نور در سراسر کشور، در صورت ثبت نام با ایمیل دانشگاهی، تا پایان فروردین ماه 1403 به مقالات سایت دسترسی خواهند داشت!
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!