Record of ultra-deep oil and gas exploration and development in Tarim Oilfield

Theoretical breakthrough, sweeping away the shadow of the past. In 2008, the Kishen 2 well obtained high-yield gas flow in the underground section of 6,573 meters to 6,697 meters, breaking the traditional understanding of "6,000 meters is the oil and gas death line" at that time, and fully opened the situation of 7,000 meters underground in the Krasu structural belt, and discovered the Krasu ultra-deep gas field under the salt.

As a result, Tarim has entered the stage of large-scale exploration in ultra-deep fields, and the exploration depth has gradually moved from 6,000 meters and 7,000 meters to 8,000 meters, gram depth 8, gram depth 9, gram depth 13, gram depth 5... By the end of 2017, a total of 12 gas reservoirs were discovered, which means the formation of the first trillion-square-atmosphere area in the Tarim Basin - the karat-gram depth atmosphere.

The situation opens up

Is there a second one?

The Research Institute of Petroleum Exploration and Development of Tarim Oilfield has set its target on the Boz-Dabei area next to Keshen, which is also located in the Kelasu structural belt with similar geological conditions and has also been explored. However, the deeper the oil and gas are buried, generally more than 7000 meters, the difficulty of exploration is great, and the scale has not been formed.

"All the good meat has been eaten, and the rest is the hard bone." Tarim oilfield exploration and development research Institute Party secretary Shi Ying said.

After studying similar basins around the world, they found no precedent to draw directly from. As a result, a number of high-level research teams inside and outside the United Nations re-sorted the faults within 5,500 square kilometers, systematically analyzed more than 1,000 natural earthquake information, and carried out hundreds of indoor physical simulation experiments. In one year, they finally identified the four major Crasu fault zones, divided four tectonic transformation zones, and innovated the modeling theory of tectonic transformation zones. Found the golden key to the hidden treasure.

In only half a year, 21 traps have been discovered and 11 new gas reservoirs have been discovered, and the natural gas exploration in Boz-Dabei has witnessed explosive growth.

Just when everyone thought that the second trillion-square atmosphere was discovered in this way, at the beginning of 2021, Bozi 21, Bozi 22 and other exploration Wells and evaluation Wells were successively defeated, giving them a blow.

What's the problem?

In order to clear the fog, the institute set up six research groups to comprehensively summarize the success and failure of 41 Wells, one by one for systematic analysis.

A month later, they set up a special class for fine exploration to systematically carry out basic research.

Special class leader Xie Hui Wen has been engaged in the exploration of the Crasu structural belt since the beginning of Kela 2, he told the Science and Technology Daily reporter: "In eight months, the special class has explained more than 30,000 square kilometers of seismic data in fine three-dimensional, nearly 3,000 core samples, piled up to load a truck, redraw more than 500 geological maps, piled up half a meter high."

At this point, the underground situation of Boz-Great North gradually became clear.

In 2021, a number of new Wells were redrilled, increasing the success rate by nearly 20 percent. Among them, the Great North 4 well has made a significant discovery at 8,143 meters, which is the highest depth of onshore clastic gas Wells in Asia, confirming that high-quality reservoirs still exist at a depth of 8,000 meters, and strengthening the confidence and determination to continue to find large gas fields in ultra-deep depths.

By the end of 2021, a total of 17 ultra-deep oil and gas reservoirs have been discovered in Boz-Great North, with submitted third-level reserves of 700 billion square meters.

"In the first quarter of this year, we implemented eight new traps, and the second trillion-atmosphere area is basically within reach." "Ms. Shiing said.

At the end of July 2022, the construction of 10 billion cubic meters capacity construction project in the Boz-Great Northern ultra-deep Atmosphere area of Tarim Oilfield began, which is the largest ultra-deep gas field project in China so far, and Boz-Great Northern has entered the full development stage, and the output of condensate oil and natural gas will reach 1.02 million tons and 10 billion cubic meters respectively by the end of the 14th Five-Year Plan.

Breaking the "depth limit"

August summer heat, red sun, silver sand dazzling eyes. Under the high temperature of more than 40 degrees Celsius, people walk in the Taklimakan desert, only feel the heat is unbearable.

In the vast expanse of the desert all the way bumpy, after a few hours of long journey, and finally hundreds of kilometers away, the reporter saw the hinterland of the desert has built an annual output of 2 million tons of large oil fields - rich man oil field.

The rig rose to the sky, standing proudly in the wind and sand.