连续型致密砂岩气近源累计聚集的特征及成因机制

郭迎春; 宋岩; 庞雄奇; 姜振学; 付金华; 杜建军

doi:10.3799/dqkx.2016.035

Volume 41 Issue 3

Mar. 2016

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Article Navigation > Earth Science > 2016 > 41(3): 433-440

Guo Yingchun, Song Yan, Pang Xiongqi, Jiang Zhenxue, Fu Jinhua, Du Jianjun, 2016. Characteristics and Genetic Mechanism of Near-Source Accumulated Accumulation for Continuous-Type Tight-Sand Gas. Earth Science, 41(3): 433-440. doi: 10.3799/dqkx.2016.035

Citation:

Guo Yingchun, Song Yan, Pang Xiongqi, Jiang Zhenxue, Fu Jinhua, Du Jianjun, 2016. Characteristics and Genetic Mechanism of Near-Source Accumulated Accumulation for Continuous-Type Tight-Sand Gas. Earth Science, 41(3): 433-440. doi: 10.3799/dqkx.2016.035

Citation:

Guo Yingchun, Song Yan, Pang Xiongqi, Jiang Zhenxue, Fu Jinhua, Du Jianjun, 2016. Characteristics and Genetic Mechanism of Near-Source Accumulated Accumulation for Continuous-Type Tight-Sand Gas. Earth Science, 41(3): 433-440. doi: 10.3799/dqkx.2016.035

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Characteristics and Genetic Mechanism of Near-Source Accumulated Accumulation for Continuous-Type Tight-Sand Gas

doi: 10.3799/dqkx.2016.035

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Institute of Unconventional Natural Gas, China University of Petroleum, Beijing 102249, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
4.
College of Geosciences, China University of Petroleum, Beijing 102249, China
5.
Changqing Oilfield Company, PetroChina, Xi'an 710018, China

Received Date: 2015-06-25
Publish Date: 2016-03-15

Abstract

Abstract

Among the unconventional gas supply sources, tight-sand gas constitutes a significant percentage, which is the most available part under current technology. It can be divided into two types, continuous-type and trap-type. Geological and geochemical differences in characteristics on migration, accumulation, and distribution between trap-type and continuous-type tight-sand gas were compared systematically. Through physical simulation experiments, the dynamic genetic mechanism of near-source accumulation of continuous-type tight-sand gas was revealed. Trap-type tight-sand gas is the result of natural gas accumulation for a long migration distance with a good conducting system, causing an obvious fractionation on gas composition and carbon isotope and resulting in the following characteristics-"convergence in conventional traps, with edge and bottom water, high-quality sealing". Continuous-type tight-sand gas is the result of near-source cumulative accumulation. Consequently, the gas composition and carbon isotope fractionation effect is unconspicuous, and discreteness exists among carbon isotopes in the same area. Different from trap-type, the continuous-type tight-sand gas exhibits the following characteristics such as "continuous distribution, near-source aggregation, complex or inverted gas / water distribution". The near-source accumulation of continuous-type tight-sand gas is consequence of counterbalance between force and resistance when gas migrates in nanoscale pore-throats developed in tight sandstone reservoirs. Before the natural gas migrates to the critical gas-water interface, it is separated into gas system and water system by the inversed gas-water interface. The gas migration force is abnormal gas pressure, while the need to generate buoyancy cannot be met. The gas migration resistances include overburden formation water pressure and capillary pressure. The magic trap of continuous-type tight-sand gas can be considered unconventional dynamic trap which core contents can be summarized as "(almost) nanoscale pore-throat, gas migrate follows the piston principle, buoyancy does not work, balance between force and resistance determines gas-water interface".
- tight-sand gas,
- near-source accumulation,
- continuous-type,
- trap-type,
- petroleum geology

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Characteristics and Genetic Mechanism of Near-Source Accumulated Accumulation for Continuous-Type Tight-Sand Gas

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