Overpressured tight oil reservoir

28 Aug 2018 The overpressure produced by the hydrocarbon generation overcomes the capillary resistance and further promotes the hydrocarbon into tight reservoir, which often manifests as the form of nonbuoyancy migration and non- 

28 Oct 2019 3 The classes of source rocks and the matching relation of source and reservoir rocks were used as evidence to optimize the sweet spots of tight oil reservoirs. There are four main lithologic types of tight oil reservoirs based on  28 Aug 2018 The overpressure produced by the hydrocarbon generation overcomes the capillary resistance and further promotes the hydrocarbon into tight reservoir, which often manifests as the form of nonbuoyancy migration and non-  6 Jan 2019 Reservoir evaluation is a method for classifying reservoirs and the description of heterogeneity quantitatively. In this study, according to the characteristics of longitudinal physical properties of tight oil reservoirs, advanced  17 May 2013 govern the volume of gas in solution with the reservoir oil, defined by the reservoir's formation volume factor. with overpressure, which enables a higher concentration of gas to be contained within a oil recovery efficiency factor in the International “Tight Oil” Resource Study consists of 28 “tight oil” plays  The mechanisms of overpressure are caused by under compaction, fluid expansion (kerogen maturation). The Gumai Formation and Talang Akar Formation are shale rocks so the type of mud weight that is well used is oil based mud (OBM). Underpressured and Overpressured Tight Gas Sands: I. a steady supply of gas from an underlying reservoir with the gas entering the san the lower boundary at Shirley, K., 2004, Debate Taps Petroleum Systems, AAPG Explorer 25, 18-19. 3 Dec 2012 Tight oil reservoirs have higher permeabilities and porosities than their shale gas counterparts, in the range of 40 microdarcys with porosities around 5%, respectively. It is slightly overpressured with a gradient of 0.52 psi/ft.

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There are four favorable conditions for the formation of tight oil: high quality source rocks and reservoirs, good source constituted good source-reservoir combinations; abnormal overpressure in tight oil reservoirs with the pressure factor of  24 Dec 2019 PDF | Tight oil is an important and potential reservoir in future China. In this paper, we surveyed the tight oil exploration status and challenges, as well as the tight reservoir properties in China, including source rocks, lithology, physical properties under the control of overpressure, the pressure coefficient. 28 Oct 2019 3 The classes of source rocks and the matching relation of source and reservoir rocks were used as evidence to optimize the sweet spots of tight oil reservoirs. There are four main lithologic types of tight oil reservoirs based on  28 Aug 2018 The overpressure produced by the hydrocarbon generation overcomes the capillary resistance and further promotes the hydrocarbon into tight reservoir, which often manifests as the form of nonbuoyancy migration and non-  6 Jan 2019 Reservoir evaluation is a method for classifying reservoirs and the description of heterogeneity quantitatively. In this study, according to the characteristics of longitudinal physical properties of tight oil reservoirs, advanced  17 May 2013 govern the volume of gas in solution with the reservoir oil, defined by the reservoir's formation volume factor. with overpressure, which enables a higher concentration of gas to be contained within a oil recovery efficiency factor in the International “Tight Oil” Resource Study consists of 28 “tight oil” plays 

3 Dec 2012 Tight oil reservoirs have higher permeabilities and porosities than their shale gas counterparts, in the range of 40 microdarcys with porosities around 5%, respectively. It is slightly overpressured with a gradient of 0.52 psi/ft.

H gas reservoir is an overpressured gas reservoir with high temperature. It is generally believed that overpressured gas reservoir exist stress sensitivity effect due to uncompaction. Firstly, this study conducted lab core test to analysis stress sensitivity of rock by defined confining pressure and decreasing inner pressure. The inter-salt shale-oil reservoir in Liutun Sag of the Dongpu Depression in the Bohai Bay Basin, China, has a strong overpressure and produces abundant heavy oil with little water. The previous researches claimed that the overpressure was mainly a result of disequilibrium compaction, which seemingly contradicts with the little water production.

Tight oil is conventional oil that is found within reservoirs with very low permeability. The oil contained within these reservoir rocks typically will not flow to the wellbore at economic rates without assistance from technologically advanced drilling and completion processes.

The initial pressure does reflect an overpressured reservoir, as it is usually observed in tight and shale oil fields 39. The overpressure is related to the cracking of the organic material and Under normal conditions, as the porosity is reduced, the interstitial fluid is expelled. When the fluid cannot escape, the pressure within the encapsulated rock mass rises. This higher fluid pressure takes on some of the overburden load, limiting the amount of compaction. In such cases, the fluid is overpressured and Tight oil is considered to be an “unconventional” reservoir, requiring horizontal wells and massive hydraulic fracture jobs to perform economically. Some siltstones are sufficiently sandy to produce oil in vertical wells, usually after a decent stimulation. dependent on the wettability of the reservoir. In an oil-wet, fractured reservoir, water will not spontaneously displace oil from the matrix, and only the oil in the fractures will be displaced, resulting in poor recoveries and ea rly water breakthrough. In water-wet fractured reservoirs, imbibition can lead to significant recoveries. reservoirs – oil and gas, clastic and carbonates, and covering a wide range of porosity and permeability – we have determined relationships for samples in any one reservoir, among: • Porosity – Pce • Porosity – Hyp1 • Porosity – SWmc • Porosity – Pcmc • Porosity – Hyp2 • Porosity – SWi Tight oil is conventional oil that is found within reservoirs with very low permeability. The oil contained within these reservoir rocks typically will not flow to the wellbore at economic rates without assistance from technologically advanced drilling and completion processes. Because overpressured sediments tend to exhibit better porosity than would be predicted from their depth, they often make attractive hydrocarbon reservoirs and are therefore of important economic interest.

Factors controlling petroleum accumulation and leakage in overpressured reservoirs Article in AAPG Bulletin 99(05):831-858 · May 2015 with 460 Reads How we measure 'reads'

24 Dec 2019 PDF | Tight oil is an important and potential reservoir in future China. In this paper, we surveyed the tight oil exploration status and challenges, as well as the tight reservoir properties in China, including source rocks, lithology, physical properties under the control of overpressure, the pressure coefficient. 28 Oct 2019 3 The classes of source rocks and the matching relation of source and reservoir rocks were used as evidence to optimize the sweet spots of tight oil reservoirs. There are four main lithologic types of tight oil reservoirs based on  28 Aug 2018 The overpressure produced by the hydrocarbon generation overcomes the capillary resistance and further promotes the hydrocarbon into tight reservoir, which often manifests as the form of nonbuoyancy migration and non-  6 Jan 2019 Reservoir evaluation is a method for classifying reservoirs and the description of heterogeneity quantitatively. In this study, according to the characteristics of longitudinal physical properties of tight oil reservoirs, advanced 

Under normal conditions, as the porosity is reduced, the interstitial fluid is expelled. When the fluid cannot escape, the pressure within the encapsulated rock mass rises. This higher fluid pressure takes on some of the overburden load, limiting the amount of compaction. In such cases, the fluid is overpressured and Tight oil is considered to be an “unconventional” reservoir, requiring horizontal wells and massive hydraulic fracture jobs to perform economically. Some siltstones are sufficiently sandy to produce oil in vertical wells, usually after a decent stimulation. dependent on the wettability of the reservoir. In an oil-wet, fractured reservoir, water will not spontaneously displace oil from the matrix, and only the oil in the fractures will be displaced, resulting in poor recoveries and ea rly water breakthrough. In water-wet fractured reservoirs, imbibition can lead to significant recoveries. reservoirs – oil and gas, clastic and carbonates, and covering a wide range of porosity and permeability – we have determined relationships for samples in any one reservoir, among: • Porosity – Pce • Porosity – Hyp1 • Porosity – SWmc • Porosity – Pcmc • Porosity – Hyp2 • Porosity – SWi Tight oil is conventional oil that is found within reservoirs with very low permeability. The oil contained within these reservoir rocks typically will not flow to the wellbore at economic rates without assistance from technologically advanced drilling and completion processes.