SEDIMENTOLOGICAL STUDY OF THE HARTHA & SAADI FORMATIONS FROM SELECTED WELLS IN QAYARA OIL FIELD NORTHERN IRAQ

Abstract

The research included sedimentological study of Hartha and Saadi formations in Qayara oil fields: (QY53, QY84, QY82, QY54). The study indicates that the rocks of both formations are composed from limestone, dolomitic limestone, and dolomite which are effected by diagentic processes such as, dolomization, neomorphism, cementation, dissolution, micritization, and compaction. The lower and upper contact between both formations are conformable due to the lithological and facies similarity between them. The essential and secondary microfacies are designated from both formations. The depositional environment of both formations indicate shelf (inner-Middle-Outer) to slope environment. (Introduction) ‫المقدمة‬ .1 ‫تكوين‬ ‫عد‬ ُ ‫ي‬ ‫في‬ ‫التكاوين‬ ‫اىم‬ ‫من‬ ‫السعدي‬ ‫و‬ ‫ثة‬ ‫اليار‬ ‫ي‬ ‫األعمى‬ ‫الطباشيري‬ ‫العصر‬ ‫من‬ ‫التكتون‬ ‫الناحية‬ ‫إذ‬ ‫الرسوبية‬ ‫و‬ ‫ية‬ ‫ي‬ ‫ضم‬ ‫العصر‬ ‫ىذا‬ ‫السحنة‬ ‫في‬ ‫متشابية‬ ‫تكوينات‬ ‫تحدد‬ ‫التي‬ ‫و‬ ، ‫يتو‬ ‫وصخار‬ ‫طباقيتو‬ ‫أسس‬ ً ‫وصول‬ ‫الطباقي‬ ‫التتابع‬ ‫و‬ ‫العمر‬ ‫ناحية‬ ‫من‬ ‫السحنية‬ ‫التداخالت‬ ‫و‬ ‫الترسيب‬ ‫حوض‬ ‫طبيعة‬ ‫إلى‬ ، ‫و‬ ‫ال‬ ‫البيئة‬ ‫ضمن‬ ‫الثانوية‬ ‫البيئات‬ ‫من‬ ‫العديد‬ ‫نشوء‬ ‫الى‬ ‫تؤدي‬ ‫التي‬ ‫ترسيبية‬ ‫ئيسية‬ ‫الر‬. ‫تكوين‬ ‫ان‬ ‫الترسيبية‬ ‫ة‬ ‫الدور‬ ‫ضمن‬ ‫ترسب‬ ‫ثة‬ ‫اليار‬ (Upper Campanian-Maastrichtian Sequence) ، ‫من‬ ‫أكثر‬ ‫إلى‬ ‫يصل‬ ‫سمك‬ ‫في‬ ‫اق‬ ‫العر‬ ‫وشمال‬ ‫وسط‬ ‫في‬ ‫رسوبياتيا‬ ‫تنتشر‬ 350)‫مستقر‬ ‫الغير‬ ‫(الرصيف‬ ‫اق‬ ‫العر‬ ‫شمال‬ ‫في‬ ً ‫ا‬ ‫متر‬