Abstract
With the in-depth development of the Sargiz oilfield in Kazakhstan, oil layer protection plays an extremely important role in the development process. The petrological characteristics and pore types of the reservoir were analyzed by X-ray diffraction and electron microscopy. The average face ratio of the reservoir was 19.30%. The main pore type was intergranular pore and the face rate was 17.52%. The total amount of clay minerals in the reservoir core is 7% - 10%, and the clay minerals are mainly illite, Yimeng, kaolinite and chlorite; the shale content of the main oil-bearing layer is about 3% - 10%. Refer to relevant industry standards for speed, water, stress, acid, and alkali sensitivity experiments to study the potential damage mechanism of the reservoir. According to the above experiments, the oilfield reservoirs have no speed-sensitive damage and are weakly water-sensitive reservoirs; the reservoirs are highly stress-sensitive and easy to produce sand when the stress changes; they have moderately weak acid sensitivity and weak-medium weak alkaline.
Highlights
The Sargiz block is still in the early stages of exploration and development, and its surrounding areas have drilled several wells since the 1990s
The petrological characteristics and pore types of the reservoir were analyzed by X-ray diffraction and electron microscopy
Sargiz Block Location Characteristics The FIOC oil field is located in the Caspian Basin of Kazakhstan
Summary
The Sargiz block is still in the early stages of exploration and development, and its surrounding areas have drilled several wells since the 1990s. The Ordovician and Carboniferous-Permian Unayzah Formations are the main reservoirs for geological prediction They have several oil and gas fields with objective oil and gas reserves and belong to natural reservoirs [1] [2] [3]. Factors such as multiple production layers and long distribution intervals, pressure systems, and variability in lithology determine the difficulty of understanding oil and gas reservoirs and protecting technologies for oil and gas layers [7]. To provide the oil and gas layer protection the five parameters sensitivity experiment was conducted
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