دراسة تغيرات الخصائص الخزنية لتشكيلة الكوراشينا دولوميت لنطاقي C2 و D1-ترياسي أوسط في حقل جحار النفطي باستخدام القياسات الجيوفيزيائية البئرية

الملخص EN

All the well logging reinterpretation by using the new softwares, cores analysis and results of seismic 2D and 3D surveys allowed to identify the reservoir characteristics of Kurachina Dolomite Formation of middle Triassic, for two zones (C2, D1) in Jihar field and its affect on hydrocarbon potential in this area.

It's found that C2 reservoir consist mostly of dolomite and small amount of shale and anhydrite, fractured and all the fractures are full of organic materials, calcite, anhydrite, silica and little amount of stilolite, while there is succession of limestone and fossil remains, in some places there is shally dolomite.

Whereas D1 reservoir is mostly crystalline limestone and the fractures filled with dolomite.

According to the seismic interpretation it's clear that the top of C2 reservoir shows a roughly oriented ESE-WNW anticline bounded to the south by largescale reverse fault system which represents southern structure edge dividing it from Al Daww depression.

A group of faults, predominantly strike slips, extends through the middle of the structure, and all these faults were resulted from tectonic movements.

Also, these faults increased the permeability of the reservoir.