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Quantitative evaluation method of cracking of disperse liquid hydrocarbon into gas

A quantitative evaluation and liquid hydrocarbon technology, applied in measuring devices, analytical materials, instruments, etc., can solve problems such as unfavorable exploration prospects and limited gas generation potential

Active Publication Date: 2015-09-30
PETROCHINA CO LTD
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Problems solved by technology

[0002] There are many sets of high-quality source rocks developed in my country's marine superimposed basins, but the marine basins have experienced the superposition process from the Paleozoic marine sediments to the Mesozoic and Cenozoic continental sediments, and the evolution degree is mostly in the high-to-mature stage. According to the cheese According to the thermal degradation theory of oil and gas generation, the gas generation potential of these formations is limited, and the prospect of exploration is not optimistic

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  • Quantitative evaluation method of cracking of disperse liquid hydrocarbon into gas
  • Quantitative evaluation method of cracking of disperse liquid hydrocarbon into gas
  • Quantitative evaluation method of cracking of disperse liquid hydrocarbon into gas

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Embodiment 1

[0070] The present embodiment provides a quantitative evaluation method for gas cracking of dispersed liquid hydrocarbons, comprising the following steps:

[0071] Step 1. Select various types of Sinian-Cambrian source rocks in the Sichuan Basin, and based on the study of oil expulsion rate, clarify the distribution of internally dispersed liquid hydrocarbons and externally dispersed liquid hydrocarbons in various source rock types Scales and base quantities such as image 3 shown.

[0072] The Sinian-Cambrian source rocks in the Sichuan Basin include mudstone and marl with different organic matter abundances. According to the analysis of organic matter abundance and type, the thermal evolution of crude oil was simulated using conventional experimental methods and experimental models. image 3 In the corresponding oil discharge rate curve, when the source rock with organic carbon less than 2% is selected, the oil discharge rate in the liquid window stage is 40%-50%; when the so...

Embodiment 2

[0084] This embodiment provides a quantitative evaluation method for gas cracking of dispersed liquid hydrocarbons, such as figure 1 shown, including the following steps:

[0085] Step 1. Select various types of Cambrian-Ordovician source rocks in the Tarim Basin, and based on the study of oil expulsion rate, clarify the distribution of internally dispersed liquid hydrocarbons and externally dispersed liquid hydrocarbons in various source rock types ratio and basic quantity, and obtain the maximum residual liquid hydrocarbon quantity and the discharged liquid hydrocarbon quantity of various source rocks in each period of thermal evolution to gas, such as figure 2 and image 3 shown.

[0086] The Cambrian-Ordovician source rocks in the Tarim Basin include mudstone and marl with different abundances of organic matter. figure 2 The experimental method shown simulates the thermal evolution of crude oil, corresponding to image 3 In the corresponding oil discharge rate curve, ...

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Abstract

The invention provides a quantitative evaluation method of cracking of disperse liquid hydrocarbon into gas. The evaluation method comprises the steps of selecting various hydrocarbon source rock of a major end member, determining a distribution ratio and basic amount of in-source disperse liquid hydrocarbon and out-source disperse liquid hydrocarbon in the various hydrocarbon source rock based on an oil drainage rate study, determining a major enrichment distribution area of out-source disperse liquid hydrocarbon via statistics of thermogenic pitch and fluorescence samples, analyzing a thermodynamic condition and a conversion rate of cracking of disperse liquid hydrocarbon into the gas, determining an effect of temperature, pressure and an inorganic mineral medium of the cracked gas on a conversion effect and an opportunity, carrying out oil gas system analysis on a particular study area, determining a basic petroleum geology condition and a main gas generation period of the cracking of liquid hydrocarbon into the gas, dividing disperse liquid hydrocarbon into in-source disperse liquid hydrocarbon and out-source disperse liquid hydrocarbon, and quantitatively calculating gas amount cracked by disperse liquid hydrocarbon. The method can quantity the gas cracked by disperse liquid hydrocarbon in the ancient hydrocarbon source rock in a marine superimposed basin.

Description

technical field [0001] The invention relates to a quantitative evaluation method for gas cracking of dispersed liquid hydrocarbons, which belongs to the field of oil and gas exploitation. Background technique [0002] There are many sets of high-quality source rocks developed in my country's marine superimposed basins, but the marine basins have experienced the superposition process from the Paleozoic marine sediments to the Mesozoic and Cenozoic continental sediments, and the evolution degree is mostly in the high-to-mature stage. According to the cheese According to the theory of oil and gas generation through thermal degradation, the gas generation potential of these formations is limited, and the prospect of exploration is not optimistic. [0003] Previous studies have shown that over-mature kerogens have limited gas generation potential, but dispersed liquid hydrocarbons inside and outside the source and cracked gas from paleo-reservoirs are important sources of deep nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 王兆云石书缘李永新胡素云姜华刘伟
Owner PETROCHINA CO LTD
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