Lecture23

Hoa Truong
Mind Map by Hoa Truong, updated more than 1 year ago
Hoa Truong
Created by Hoa Truong about 6 years ago
19
0

Description

Lecture 23 - Generation, Migration & Preservation of Petroleum

Resource summary

Lecture 23
  1. Source rock
    1. rocks with high TOC (total organic carbon), algae/plankton rich, spores, pollen, land plant remains
      1. formed in low energy, stagnant (no circulation), anoxic (low oxygen) environment
        1. often fine-grained
          1. rate of decomposition - preserve organic materials
            1. too slow- bacteria /oxidation on surface
              1. too rapid- diluted by sediments
              2. production of organic matter - accumulation/concentration in sediments - preserve from bacteria/oxidation
                1. Decomposition environment
                  1. lake, basin, swamps, marshes, river, delta, anoxic zones
                2. Generation
                  1. source kitchen
                    1. area where source rocks have matured
                    2. burial and chemical alternation of organic material - organic matters broken into kerogen which then broken into petroleum
                      1. Kerogen
                        1. Lipid rich kerogen & sapropelic kerogen
                          1. marine organisms
                            1. oil
                          2. Humic kerogen
                            1. land organisms
                              1. gas
                          3. Maturation process
                            1. oil generation requires temp: 50-90 to be mature, cease at 140-170degree (oil windown)
                              1. controlled by temp & time
                                1. gas generation increases above 150degree, cease at 200-230degree (gas window)
                                  1. degree determine by kerogen colour: darker-high temp-more mature
                                    1. source potential: not reach oil window (immature), hotter than gas window (overmature), max. temp reached
                                    2. Temperature
                                      1. lower limit
                                        1. Present day temperature in wells
                                        2. upper limit- max.temp reached
                                          1. Vitrinite reflectance
                                            1. spore/pollen colouration index
                                              1. kerogen colouration index
                                              2. rock can experience different temp from present temp in the past due to temp gradient decrease with time/ uplifted
                                                1. below 80: biodegradation: bacteria destroy oil
                                                2. Burial history (geohistory of basin)
                                                  1. model, evaluate if/when source mature before
                                                3. Migration
                                                  1. Primary
                                                    1. from rock to carrier bed (solution in water, gas, droplets, globules, microfacturing)
                                                    2. Secondary
                                                      1. from carrier bed (permeable layers) - trap (buoyancy)
                                                        1. affect by poresize, rock type
                                                        2. Tertiary
                                                          1. through seal (tilting, faulting, capillary failure)
                                                          2. buoyancy force vs capillary pressure
                                                            1. water washing
                                                              1. removal of gas+light HC by solution in moving water
                                                              2. Fault/seal breach
                                                                1. Movement of petroleum from source -trap
                                                                2. Preservation
                                                                  1. Decrease with time as processes (heating, lift, fold, erosion)
                                                                    1. Age distribution of oil fields often young - require: little/no tectonic activity
                                                                  Show full summary Hide full summary

                                                                  Similar

                                                                  LECTURE 22
                                                                  Hoa Truong
                                                                  LECTURE 21
                                                                  Hoa Truong
                                                                  LEC 1-DRILLING
                                                                  Hoa Truong
                                                                  Life in Germany
                                                                  Ben C
                                                                  Geography AQA Revison topics Migration, Population Change, Youthful Populations and more
                                                                  dburns8731
                                                                  Treaty of Versailles (1919)
                                                                  Inez Simpson
                                                                  George- Of mice and men
                                                                  Elinor Jones
                                                                  “The knower’s perspective is essential in the pursuit of knowledge.” To what extent do you agree with this statement?
                                                                  Lucia Rocha Mejia
                                                                  Treaty of Versailles (1919)
                                                                  OWL 2336
                                                                  Project Scope Management Process
                                                                  neeshar
                                                                  Physics - Electricity
                                                                  dana-howbridge