Kinetics of oil group-type generation and expulsion: An integrated application to Dongying Depression, Bohai Bay Basin, China

Wei, Zhifu; Zou, Yan–Rong; Cai, Yong; Wang, Lei; Luo, Xiaorong; Peng, Ping’an

doi:10.1016/j.orggeochem.2012.08.006

Cited by 58 publications

(33 citation statements)

References 57 publications

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“…The high oil expulsion efficiencies for type I and type II kerogen in the oil window were also validated by geological section studies in the Ordos Basin (Zhang et al, 2006) and Bohai Bay Basin (Pang et al, 2005). Meanwhile, the transformation ratio of oil from type I and II kerogen may reach 60% or more, as evidenced by many laboratory and field observations (Andresen et al, 1995;Pepper and Corvi, 1995;Behar et al, 1997;Lewan, 1997;Xiong et al, 2002;Pan et al, 2010;Lewan and Roy, 2011;Wei et al, 2012). The high transformation ratio, in conjunction with high expulsion efficiency, allows substantial kerogen mass loss during the oil expulsion.…”

Section: Introductionmentioning

confidence: 72%

“…Calculations based on the swelling theory and experimental data have shown that oil expulsion efficiencies of type I and II kerogen could be very high (from 40-90%), and vary with hydrocarbon generation potentials (type of organic matter), maturity and compositions of generated oils (Sandvik et al, 1992;Ritter, 2003;Kelemen et al, 2006b;Wei et al, 2012). The high oil expulsion efficiencies for type I and type II kerogen in the oil window were also validated by geological section studies in the Ordos Basin (Zhang et al, 2006) and Bohai Bay Basin (Pang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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The effect of oil expulsion or retention on further thermal degradation of kerogen at the high maturity stage: A pyrolysis study of type II kerogen from Pingliang shale, China

Jia

Wang

Liu

et al. 2014

Organic Geochemistry

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

The effect of oil expulsion or retention on further thermal degradation of kerogen at the high maturity stage: A pyrolysis study of type II kerogen from Pingliang shale, China

Jia

Wang

Liu

et al. 2014

Organic Geochemistry

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“…That solvent extraction liberates more 'oil' suggests the additional 'oil' occupies pores made more accessible by the presence of solvents. This effect is noted during solvent swelling of kerogens (Kelemen et al, 2006), with both swelling and retention decreasing with maturity through the oil window defined as %EasyRo ϭ 0.75 -1.00 (Wei et al, 2012). Both thermal and solvent extraction supports the concept that kerogen porosity dominates the storage capacity of these shales.…”

Section: Discussionmentioning

confidence: 73%

Pyrolysis, Porosity and Productivity in Unconventional Mudstone Reservoirs: Free and Adsorbed Oil

Raji¹,

Gröcke²,

Greenwell³

et al. 2015

Unconventional Resources Technology Conference

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Rock-Eval pyrolysis analysis of unconventional mudstone reservoirs use the S1 peak (kg free liquid per tonne of rock) to determine the volume of oil that can be potentially produced by hydraulic fracking. The data presented in this paper were obtained from a study of the unconventional oil potential of the marine late Jurassic Kimmeridge Clay Formation of the southern Viking Graben area of the UK and Norwegian sectors of the North Sea. Typical marine silty mudstones with Ͼ2%TOC contains Ͻ1kg/t (0.1wt. %) of free oil when immature at depths Ͻ2.5km and Tmax Ͻ420°C. The peak saturation of free oil rises to values of 12kg/t, with a typical peak average of ϳ6kg free oil/tonne of rock (0.6wt.%). Such average values are reached when mature at depths of 3.4km and Tmax values of 435°C in the North Sea. Converting Rock-Eval S1 yields to volume percent, the average mature mudstone contains about 1.8vol% of free oil. How does this compare with the accessible porosity of the mudstone?Conventional log analysis for porosity measures everything that is not mineral grains as pore space, but fluid injection methods (mercury, helium) measure the effective porosity, a more realistic measure of open pores that are available to petroleum. In the case of log-derived porosities, closed porosity and structured (fixed) water are counted, but appear not to be open to Rock-Eval free oil (S1) and hence for 'saturation'. Comparing typical peak S1 volumes (1.8 vol. %) against mudstones porosities (1.62 vol. %), suggests, within error, that the open porosity is fully saturated with oil at peak maturity. In addition the distributions of porosity and S1 yields are similar.However, if the S1 yield at peak maturity is totally a function of porosity; the S1 yield should be independent of the amount or type of kerogen. This is not so. Plotting S1 yield against TOC shows a strong positive correlation, with a gradient of 0.7kg/t per 1%TOC and an intercept of about 1%TOC. This gradient indicates that the S1 'oil' is partitioned between the kerogen and the porosity. Given the size of the molecules relative to the micro-porosity of the largely amorphous kerogen, the oil is likely to be absorbed onto the kerogen surface. This explains the asymmetry (or shoulders) seen on the pyrograms of S1 peaks, the main peak representing easily liberated liquids in open porosity and the shoulder the more strongly adsorbed liquids. The additional adsorbed liquid is more efficiently recovered and can be quantified by solvent extraction of the mudstones, where saturates ϩ aromatics are shown to be over twice the Rock-Eval S1 yield. Thus, like Unconventional gas, this evidence suggests that Unconventional liquids too may derive from 'free' and 'adsorbed' oil, and that both are mainly stored within organic (kerogen) porosity.

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“…Previous studies have indicated that there were at least two episodes of oil generation and accumulation [26]. The first episode occurred in the late Paleogene when Es L 3 and Es U 4 source rocks entered the oil window.…”

Section: Petroleum Systemsmentioning

confidence: 99%

Geometry, kinematics and dynamic characteristics of a compound transfer zone: the Dongying anticline, Bohai Bay Basin, eastern China

et al. 2016

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Abstract:The Dongying anticline is an E-W striking complex fault-bounded block unit which located in the central Dongying Depression, Bohai Bay Basin. The anticline covers an area of approximately 12 km 2 . The overlying succession, which is mainly composed of Tertiary strata, is cut by normal faults with opposing dips. In terms of the general structure, the study area is located in a compound transfer zone with major bounding faults to the west (Ying 1 fault) and east (Ying -8 and -31 faults). Using three-dimensional seismic data, wireline log and checkshot data, the geometries and kinematics of faults in the transfer zone were studied, and fault displacements were calculated. The results show that when activity on the Ying 1 fault diminished, displacement was transferred to the Ying -8, Ying -31 and secondary faults so that total displacement increased. Dynamic analysis shows that the stress fields in the transfer zone were complex: the northern portion was a left-lateral extensional shear zone, and the southern portion was a right-lateral extensional shear zone. A model of potential hydrocarbon traps in the Dongying transfer zone was constructed based on the above data combined with the observed reservoir rock distribution and the sealing characteristics of the faults. The hydrocarbons were mainly expulsed from Minfeng Sag during deposition pe- riods of Neogene Guantao and Minghuazhen Formations, and migrated along major faults from source kitchens to reservoirs. The secondary faults acted as barriers, resulting in the formation of fault-bound compartments. The high points of the anticline and well-sealed traps near secondary faults are potential targets. This paper provides a reservoir formation model of the low-order transfer zone and can be applied to the hydrocarbon exploration in transfer zones, especially the complex fault block oilfields in eastern China.

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Kinetics of oil group-type generation and expulsion: An integrated application to Dongying Depression, Bohai Bay Basin, China

Cited by 58 publications

References 57 publications

The effect of oil expulsion or retention on further thermal degradation of kerogen at the high maturity stage: A pyrolysis study of type II kerogen from Pingliang shale, China

The effect of oil expulsion or retention on further thermal degradation of kerogen at the high maturity stage: A pyrolysis study of type II kerogen from Pingliang shale, China

Pyrolysis, Porosity and Productivity in Unconventional Mudstone Reservoirs: Free and Adsorbed Oil

Geometry, kinematics and dynamic characteristics of a compound transfer zone: the Dongying anticline, Bohai Bay Basin, eastern China

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