Target Evaluation Of Gaotaizi Major Reservoirs In Qian 145 Block, Songliao Basin

Qian 145 block belongs to Qianan oil field, Songliao basin. The main oil layer in Gaotaizi target bed is thin alternating layer with sandstone and mudstone. Based on the current integrative phase, researches on tectonic feature, sedimentary microfacies and sand distribution are significant for expanding the east development and evaluating the west exploration.Based on sedimentology, reservoir geology and oil and gas geology, thesis takes full use of geologic, geophisical, drilling and formation testing data to develop tectonic interpretation, sedimentary microfacies analysis and sand distribution forecasting. Integrate the characteristic of hydrocarbon accumulation to give out the advices on enlarging the develop block and prefering the exploratory block eventually.The main achievements and acquaintances are including:1. Know well about tectonic feature through the detailed siesmic interpretation. The structure of researcharea is a NW anticline which is high in east and low in west. Devided into west slope region and east anticline region by No. 6 and No. 7 faults.2. Establish the template of logging microfacies interpretation via core observation. Gaotaizi oil layer maily develops estuary dam and sheet sand which distribute in belt along source area.3. Start with reservoir forecasting under integrating seismic attribute and well-seis combination inversion. It is concluded that the east developping area has expanding potential and that the west exploratory area has deep large sand. The error of sand deep forecasting is in two meters so that the precision of reservoir forecasting is improved.4. Based on the hydrocarbon accumulation characteristic, put forward well deployment proposal. Dispose 19 producing wells in the east border, and partition three advantaged zones with 50 wells.