For the first time in China, rock samples were taken out at a depth of 9,900 meters
As of 9 o'clock this morning, China's first 10,000-meter exploration well, Deep Taco 1, has been drilled to a depth of 9,940 meters, leaving 60 meters from the 10,000-meter mark. When the deep Taco 1 well broke through 9,900 meters, the staff took out rock samples at this depth, which is also the first time that rock samples have been obtained at a depth of 9,900 meters in China.
Rock samples are carried to the surface by drilling fluid after the drill bit breaks the rock, and the geologists fish, clean, and dry them for selection, and through the analysis of these samples, the rock information in the depths of the formation can be obtained in real time.
Deng Yi, Geological Director of PetroChina Tarim Oilfield Supervision Center: This is the rock cuttings of 9,900 meters that we have just cleaned. It's dolomite, like this porcelain dish in my hand, it's hard, but it's brittle, and the drill bit shatters when you touch it.
Since the drilling of the 10,000-meter deep well, detailed rock samples have been obtained at a depth of less than 9,000 meters, and the geological characteristics of the rock samples have been described, and the first 10,000-meter deep geological profile map in China will be drawn.
Deng Yi, Geological Director of PetroChina Tarim Oilfield Supervision Center: In order to obtain all the geological data of the 10,000-meter well, we take underground rock samples in a timely and accurate manner every meter, especially after entering 9,800 meters, in order to sprint to 10,000 meters, we take rock samples every 50 centimeters, and do geological analysis in a timely manner to provide geological basis for engineering decision-making.
Since the drilling of this well, more than 8,000 precious underground rock samples have been collected and obtained, reflecting the ancient geological information from more than 60 million to more than 500 million years ago, which will provide first-hand resources for in-depth study of sedimentary evolution and oil and gas accumulation in the Tarim Basin, and at the same time provide detailed original data for scientific research and resource exploration of ultra-deep strata in China.
How is a rock perceived?
The rock samples of various shapes are all peeled off from the rock nearly 10,000 meters underground by drill bits, so how is this grain of rock debris seen through? Let's do it.
Wang Xiaoming is the engineer of the geological experiment on this 10,000-meter well, and his main task is to polish the rock taken from the depths of the formation into 003 mm lamellae of rock to identify mineral composition and structural characteristics.
Wang Xiaoming, Geological Experimental Engineer of Tarim Oilfield, PetroChina: 0What is the concept of 03 mm, which is roughly equivalent to half the thickness of an adult's hair. If this criterion is not met, it will be impossible to identify different mineral species through differences in optical characteristics, which may lead to misjudgment in geological research.
Grinding thin sections is a delicate job, first of all, you need to select 1 2 mm cuttings, equivalent to the size of mung beans, the whole process is all by hand grinding, very test people's eyesight, hand strength and endurance.
Wang Xiaoming, Geological Experimental Engineer of Tarim Oilfield of PetroChina: The most important thing is how to grind the rock sample to 003 mm, first of all, it must be polished to a slight translucency, probably to the thickness of the hair first, this process needs to rely on the feel of a little bit to perceive the change in thickness, and finally combined with a microscope to polish and correct a little bit, until the standard thickness is reached.
Wang Xiaoming told reporters that the drilling is about to reach 10,000 meters underground, and the formation lithology changes rapidly, so it is necessary to grasp the formation information at all times for drilling to provide reference.
Wang Xiaoming, Geological Experimental Engineer of Tarim Oilfield of PetroChina: From drilling into 9,000 meters to now approaching the 10,000-meter mark, we have polished nearly 300 rock slices on site, including three categories and 12 sub-categories, providing reference for the integration of geology and engineering.
The rocks that are close to 10,000 meters underground are amazing.
China's first 10,000-meter exploration well deep Taco has taken out a lot of rock samples in the process of advancing to a depth of 10,000 meters, these rocks have different colors and shapes under the microscope, and they have been sleeping underground for hundreds of millions of years.
All kinds of rocks displayed in front of everyone's eyes were taken out from 9,500 to 9,900 meters underground, and these rocks were obtained for the first time in our country.
Yang Guo, Project Manager of the Basic Research Department of the Tarim Oilfield Exploration and Development Research Institute of PetroChina: This rock is like a bright nebula, and like a bustling city under the night sky, its scientific name is siliceous rock, it is very hard, much harder than our fingernails, and is generally used to make ceramics or glass. This rock is the most colorful mineral aggregate we have ever made, and it is like a colorful canvas that shows us the colorful world of 10,000 meters underground. This rock is like a **, in fact it is quartz, and the crystal stone we usually see is mainly composed of this mineral.
More than 500 rock samples of various shapes have been polished into this well, which can provide geologists with information on the sedimentary evolution of rocks and show people what has happened to the sea at a depth of 10,000 meters.
Sun Jinsheng, Academician of the Chinese Academy of Engineering: The deep-ground Taco 1 well is positioned as a scientific exploration well, and our main purpose is to reveal the physical and chemical characteristics of rocks and fluids in the 10,000-meter deep formation, and the drilling of the 10,000-meter deep well will also provide a crucial case for our basic geological theory, earth thermodynamics, geochemistry and other disciplines.
* CCTV news client.
Edited by Hu Weike.
Second instance Liu Juan.
Third trial Zhou Wenjun.