T739Fault Zone Of The Ordovician Reservoir In Tahe Oilfield Characteristics

T739fault zone crossing of Ordovician in Tahe oilfield of Tahe oil field10,12inthe Northwest area, Southwestern Tuoputai area, the geological formations of blocksbelonging to Akekule in Northern uplift of the Tarim basin in the South-West.?Earlyexploration has indicated that, in Ordovician reservoir in Tahe oil field control due tomany factors, the formation of faults and the fault on the formation of carbonatefracture-cavity reservoirs in the Ordovician and control is clear, the fault zone inkarst-vuggy carbonate reservoir heterogeneity is stronger, reservoir characteristics ofits complex. Predecessors to research references break phases on the basis of researchresults, extension based on breaking trend, breaking away from the size, length,broken, broken evolution profile, combined with cores, flakes, drilling, well logging,logging, testing, seismic data, the T739distribution law of fracture reservoircharacteristics and development and research, reached the following understanding:1. Caledonian T739fault is mainly medium and haixi NNE of early andlate hercynian tectonic movement formed the shear properties of reverse fault,combined with thinning out line from South to North the fault with T739, S99well as nodes are divided into three segments, fracture to the North and graduallyweakened.2. Caledonian medium and early hercynian, karst landforms (Karst height,slope in karst and karst depressions) and karst water systems (surface andunderground river flow and kV) development, forming a large fracture-cavitysystem. Karst Highlands, vertical erosion is strongly conducive to formation offracture-cavity system. T739well north of the main early hercynian ? and ?karstification. ? or South of the Caledonian Karst hills of the medium-term.3. Can be seen from the sedimentary facies, T739well north of the fault ? and ? in Sangtamu group, lianglitage group, Yijianfang group with varyingdegrees of erosion.4. Paleokarst and reservoir development and fracture function is closelyrelated to, the fault is usually-cave reservoir development favorable areas,especially in fracture reservoir more interchange and development. T739--S99?of the fault segment is the interchange with Aidingkeguo fault reservoir is better;The I segment along the master fault zone south of the T739the faultdevelopment-intensive areas and multiple fracture Interchange cave is developedbut on a smaller scale; S99well north of ? of fracture deterioration of thedegree of development away from the trunk to the fault zones karst weakened,some caves are filled with relatively poor reservoir development.5. Reservoirs are developed in the Lower Ordovician, the longitudinaldirection of the T₇⁴(Lower Ordovician top surface) within a certain range,different parts of the cave drilled rate;Fault zone segment I T₇⁴60m cave drillingrate,60m local development; Fault zone segment II T₇⁴top surface0-100m isdeveloped, local development below100m; the fault zone III segment cave mainlydeveloped under T₇⁴less than80m.