"Magnifying Glass" Explores Reservoirs in Jianghan Old Area and Obtains "Treasures"

Sinopec News Network reported on August 5, after the fracturing of the exploration evaluation well Guang 7901 in the southern slope block of the Banghu syncline, a high-yield industrial oil stream with a daily output of 27 cubic meters was obtained
.

This is another successful exploration achievement of Jianghan Oilfield in the periphery of Banghu in the old oil area after drilling high yields in wells such as Yan 12 and Guangxie 79

After more than 50 years of exploration and development in the old oil area of ​​Jianghan Oilfield, rolling exploration objects are becoming increasingly complex, showing the characteristics of "smaller, more fragmented, more scattered, and thinner", and the difficulty of finding new oil-bearing blocks is increasing year by year
.

Since the beginning of this year, facing the reality of increasingly concealed oil reservoirs and increasing difficulty in research, the Jianghan Oil Production Plant of Jianghan Oilfield, which is mainly responsible for the exploration and development of old areas, has focused on the "effectiveness of old oil areas" in order to implement the target of 1.

"Magnifying glass" explores the reservoir, revealing the "gold mine" of lithologic oil reservoirs

This year's exploration key Banghu syncline zone and Huangchang slope zone belong to lithologic oil reservoirs, most of which are relatively hidden and difficult to discover
.

Jianghan Oil Production Plant refined the description of reservoir stratification, divided the ideas according to the rolling exploration unit, and searched and searched for the reservoir by carpet, and finally obtained the "gold mine" of the oil reservoir

For lithological oil reservoirs, the staff of the Geological Research Institute of Jianghan Oil Production Plant used an overall research method when studying the temporary distribution of single sand bodies in the reservoir in the past
.

Due to the prolonged development, the exploration of the main part of the Jianghan lithologic reservoir has been completed, and the remaining part of the reservoir formation conditions are not good.

"In the past, the overall research of prospecting was like holding a low-powered magnifying glass to see the lines on a huge piece of gold.
Now the gold has become broken gold, scattered everywhere on the ground.
It is necessary to use a high-powered telescope to investigate the places where the broken gold may be buried.
Search, search in all directions
.

" Chang Junjie, deputy director of the Geological Institute of Jianghan Oil Production Plant, told reporters

　　After exploration and analysis, the staff of the Geological Institute of Jianghan Oil Production Plant took the Zhanggang monoclinal zone and the Banghu syncline zone as important potential target areas.
Through the comparative study of sedimentary microfacies and fine layers, they successively visited Huangchangqian 41 and Banghu South Poqian 343 (12 Rhythm) found lithological trap groups
.

The Huang50xie-1 well is located in the slope zone of the Huangchang.

　　In March of this year, Jianghan Oil Production Plant also prioritized the deployment of Well Guang 231 Inclination-6 in the old area, drilling into the target zone 1.
2 meters into the oil layer, and Well Huang 50 Inclination-1 jointly confirmed the available reserves of 314,000 tons, which confirmed the Zhanggang monoclinic.
There are rolling exploration potentials in subdivision layers in the Banghu syncline zone and the Banghu syncline zone
.

　　Drilling "off-target" cites thinking, adjusts perspective, and digs "treasure"

　　This year’s exploration key Tankou uplift is a complex fault block.
Although it has always been an advantageous area for oil and gas accumulation, the Tankou uplift is close to the Qianbei fault.
At the same time, it was uplifted and denuded during the Qiansan Oil Formation period, and its structural shape is present.
With the characteristics of "smaller, more fragmented, and more scattered", the structure is complex, and it is difficult to implement the goals
.

Jianghan Oil Production Plant strengthened detailed research on complex structural belts, deepened the understanding of reservoir formation, innovated geological viewpoints, and finally dug into the "treasure" after thought adjustments

　　In view of the "smaller, more fragmented, and more scattered" structure of the Tankou Uplift Zone, the staff of the Geological Institute of Jianghan Oil Production Plant last year relied on the new three-dimensional seismic data from Tankou to re-organize the historical evolution of the regional structure and the characteristics of morphological distribution.
Focusing on the re-recognition of the structural characteristics of the Dai 14 well area in the Daihe area, the study found that due to the influence of the Han River, the drilling trajectories of many old wells were drilled along the formation without encountering the target layer, and the phenomenon of "off target" occurred
.

　　Based on this understanding, the staff proposed to re-establish the fault interpretation model, and through strengthening the comprehensive analysis of the fine interpretation of seismic data, reservoir distribution and accumulation law, etc.
, it is believed that the western part of Daihe has the potential for expansion, and the rolling well generation 14 should be deployed in the high position.
Oblique -16C
.

The well was completed on February 2, and the oil layer was 6.

　　Strengthen the evaluation of oil reservoirs, control reserves and promote upgrades

　　Jianghan Oil Production Plant gave full play to the technological advantages of the cooperation between the plant and the institute, and carried out joint research with the Research Institute of Exploration and Development and the Research Institute of Geophysical Exploration, intensified oil reservoir evaluation, controlled reserves and promoted upgrading
.

　　Based on the study of sedimentary microfacies, the two parties used high-resolution seismic data for seismic inversion and reprocessing, established different forward models, and clarified the seismic waveform structure characteristics of the sand body encountered in Well Yanxie 12
.
Continue to track the distribution of sand bodies, accurately depict the lithological boundary of Yanxian 12 traps, and have more accurate positioning.
The evaluation well Yan 12xie-3 well was deployed.
The well successfully drilled a 6.
0-meter oil layer, with a daily output of 7 tons.
The available reserves were 49.
2.
Ten thousand tons, expanding the position of high-quality production on the east slope of Banghu
.

　　"In the next step, the geotechnical staff of Jianghan Oil Production Plant will deepen basic research, strengthen technical research, adhere to multi-layer and multi-field three-dimensional exploration, and continuously improve the effective use of reserves in the Qianjiang Sag, making new contributions to the rolling exploration of the oil field
.
" Chang Junjie told reporters
.
(Huang Hui, Wang Rui, Huang Di Xiaosheng)