Cenomanian-Early Campanian Carbonate Reservoir Rocks of Northwestern Iraq: Diagenesis and Porosity Development

Al-Kitab Journal for Pure Sciences Pub Date : 2018-12-30 DOI:10.32441/kjps.02.02.p1

M. Al-Haj, A. Al‐Juboury, A. Al-hadidy, D. Hassan

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引用次数: 2

Abstract

The present work focuses on the upper Cretaceous (Cenomanian-early Campanian) carbonate successions in selected wells from northwestern Iraq. These successions are represented by Gir Bir (Cenomanian-early Turonian), Wajna (late Santonian) and Mushorah (early Campanian) Formations. The succession has affected by early burial near-surface, unconformity-related and deep burial diagenesis represented by cementation, neomorphism, dolomitization, dedolomitization, silicification, authigenesis of glauconite and pyrite, compaction, micritization, solution and porosity formation. The common porosity types are intergranular, fenestral, intercrystalline, moldic, vuggy, channel and fracture. Three porosity zones (I, II, and III) are identified depending on variation in gamma ray which reflects their shale content. The upper part of zone (II) is highly porous and regarded on the main reservoir unit in the middle and upper parts of the Gir Bir Formation. Fracture and moldic and vuggy dissolution features in addition to karstic and fissure features are responsible for the porosity increase in the fractured reservoir unit.

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伊拉克西北部塞诺曼—早坎帕世碳酸盐岩储层成岩作用与孔隙发育

目前的工作重点是在伊拉克西北部选定的井中进行上白垩世(塞诺曼—早坎帕尼亚)碳酸盐岩演替。这些演替以吉尔比尔组(cenomanian - Turonian早期)、瓦伊纳组(Wajna)和穆索拉组(Mushorah)为代表。早期埋藏近地表成岩作用、不整合成岩作用和深埋藏成岩作用影响了演替过程，主要表现为胶结作用、新形作用、白云石化作用、脱白云石化作用、硅化作用、海绿石和黄铁矿自生作用、压实作用、泥晶化作用、溶蚀作用和孔隙形成作用。常见的孔隙类型有晶间、窗状、晶间、模状、洞状、槽状和裂缝状。根据反映页岩含量的伽马射线变化，确定了3个孔隙层(I、II和III)。(II)带上部孔隙度较高，是吉尔比尔组中上段的主要储层单元。裂缝性储层单元孔隙度增加的主要原因是裂缝、溶蚀、溶蚀特征和岩溶、裂隙特征。

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Al-Kitab Journal for Pure Sciences

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