THE FUTURE PROSPECTIVITY OF THE PERTH BASIN

1989 ◽  
Vol 29 (1) ◽  
pp. 440 ◽  
Author(s):  
P.B. Hall
Keyword(s):  
Source Rock ◽  
Source Rocks ◽  
Northern Area ◽  
Type Iii ◽  
The Past ◽  
Recoverable Reserves ◽  
The Future ◽  
Exploration Risk ◽  
Seismic Acquisition ◽  
The Veil

The Perth Basin may have been regarded in the past as prospectively poor, but things are about to change! Seismic quality was generally poor, reservoirs often tight and source- rock maturity data limited. Abundant source rocks which tend to have a predominance of Type III kerogens have been identified and the basin has often been referred to as gas prone, the two largest discoveries having combined recoverable reserves greater than 444 billion cubic feet (12.5 Gm3).Advances in seismic acquisition and processing, available from the early 1980s, is drawing back the veil that has enveloped major areas of the basin for many years. An estimated 29 wells out of 40 exploration wells studied in the northern area of the Perth Basin were drilled off- structure. Established plays are now being correctly delineated and oil- prone source rocks with good generative potential have been identified.Perhaps the most significant occurrence in the Perth Basin was the discovery of a new play in 1987 which stimulated a new round of activity. This will undoubtedly provide economic discoveries for the participants. This renewed prospectivity will spill over into the offshore areas in the near future.The northern area of the Perth Basin has an historic exploration risk of 12.5 per cent. With future exploration risk predicted at 20- 30 per cent, this area will become one of the most prospective onshore basins in Australia.

scholarly journals GEOCHEMICAL AND GEOSTATISTICAL ASSESSMENT OF CRETACEOUS COALS AND SHALES IN SOME NIGERAIN SEDIMENTARY BASINS FOR THEIR HYDROCARBON PRONESS AND MATURITY LEVELS

2020 ◽  
Vol 1 (2) ◽  
Keyword(s):  
Source Rock ◽  
Oil And Gas ◽  
Linear Regression Analysis ◽  
Sedimentary Basins ◽  
Source Rocks ◽  
Hydrocarbon Generation ◽  
Good Source ◽  
Type Iii ◽  
Limit Value ◽  
The Impact

The Rock–Eval pyrolysis and LECO analysis for 9 shale and 12 coal samples, as well as, geostatistical analysis have been used to investigate source rock characteristics, correlation between the assessed parameters (QI, BI, S1, S2, S3, HI, S1 + S2, OI, PI, TOC) and the impact of changes in the Tmax on the assessed parameters in the Cretaceous Sokoto, Anambra Basins and Middle Benue Trough of northwestern, southeastern and northcentral Nigeria respectively. The geochemical results point that about 97% of the samples have TOC values greater than the minimum limit value (0.5 wt %) required to induce hydrocarbon generation from source rocks. Meanwhile, the Dukamaje and Taloka shales and Lafia/Obi coal are found to be fair to good source rock for oil generation with slightly higher thermal maturation. The source rocks are generally immature through sub-mature to marginal mature with respect to the oil and gas window, while the potential source rocks from the Anambra Basin are generally sub-mature grading to mature within the oil window. The analyzed data were approached statistically to find some relations such as factors, and clusters concerning the examination of the source rocks. These factors were categorized into type of organic matter and organic richness, thermal maturity and hydrocarbon potency. In addendum, cluster analysis separated the source rocks in the study area into two groups. The source rocks characterized by HI >240 (mg/g), TOC from 58.89 to 66.43 wt %, S1 from 2.01 to 2.54 (mg/g) and S2 from 148.94 to 162.52 (mg/g) indicating good to excellent source rocks with kerogen of type II and type III and are capable of generating oil and gas. Followed by the Source rocks characterized by HI <240 (mg/g), TOC from 0.94 to 36.12 wt%, S1 from 0.14 to 0.72 (mg/g) and S2 from 0.14 to 20.38 (mg/g) indicating poor to good source rocks with kerogen of type III and are capable of generating gas. Howeverr, Pearson’s correlation coefficient and linear regression analysis shows a significant positive correlation between TOC and S1, S2 and HI and no correlation between TOC and Tmax, highly negative correlation between TOC and OI and no correlation between Tmax and HI. Keywords- Cretaceous, Geochemical, Statistical, Cluster; Factor analyses.

The coupled generation of organic acids and hydrocarbons during source rock maturation

2020 ◽  
Author(s):  
Jian Chen ◽  
Jie Xu ◽  
Zhenyu Sun ◽  
Susu Wang ◽  
Wanglu Jia ◽  
...  
Keyword(s):  
Organic Acids ◽  
Source Rock ◽  
Maximum Yield ◽  
Source Rocks ◽  
Type I ◽  
Hydrocarbon Generation ◽  
Pore Waters ◽  
Reservoir Properties ◽  
Type Iii ◽  
Short Period

&lt;p&gt;&lt;strong&gt;Introduction: &lt;/strong&gt;Organic acids which are commonly detected in oilfield waters, can partially enhance reservoir properties. Previous studies have suggested that cleavage of the oxygen-containing functional group in kerogen is a major source of organic acids. However, this cleavage is assumed to occur before the source rock enters the oil window. If this is correct, then these acids can dissolve only minerals in the source rocks. Presently, no detailed study of the generation of organic acids during the whole thermal maturation of source rocks has been conducted. It is unclear whether organic acids could migrate into reservoirs.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Aim: &lt;/strong&gt;This research simulated the thermal evolution of source rocks in order to build a coupled model of organic acid and hydrocarbon generation, and investigate if organic acids generated in source rocks can migrate into reservoirs.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Methods: &lt;/strong&gt;Three immature source rocks containing type I, II, and III kerogens were crushed to 200 mesh. These powders, along with deionized water, were sealed in Au tubes and heated to 220&amp;#8211;360&amp;#176;C for 72 h (EasyRo 0.37-1.16%). All the run products, including organic acids, gas, and bitumen, were analyzed.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;At all temperatures, the organic acids dissolved in the waters are composed of formate, acetate, propionate, and oxalate. Acetate is the major compound with a modal proportion of &gt;83%. The maximum yield of total organic acids was from source rocks containing type I kerogen (31.0 mg/g TOC), which was twice that from source rocks containing type II and III kerogens (13.3&amp;#8211;15.4 mg/g TOC). However, for the type I and II kerogen-bearing source rocks, the organic acids reached a maximum yield (EasyRo = 1.16%) following the bitumen generation peak (EasyRo = 0.95%). Organic acids from type III kerogen-bearing source rocks reached their maximum yield (EasyRo = 0.95%) before the source rock entered the gas window (EasyRo &gt; 1.16%).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Conclusions: &lt;/strong&gt;Our data suggest that the generation of organic acids is coupled with the generation of oil from type I and II kerogen-bearing source rocks, but form earlier than gas from type III kerogen-bearing source rocks. As such, some organic acids dissolved in pore waters are possibly expelled from source rocks containing type I and II kerogen with oils, which can then migrate into reservoirs. Migration of organic acids into reservoirs from source rocks containing type III kerogen is also possible in some situations. For example, when a source rock is rapidly buried for a short period, such as in the Kuqa Depression, Tarim Basin, China, the generation interval of organic acids and gas is short. Both could be expelled outside and migrate upwards into reservoirs. In conclusion, organic acids derived from source rocks can contribute to reservoir alteration.&lt;/p&gt;

scholarly journals SOCIO-CULTURAL FOUNDATIONS OF THE CHINESE MODEL OF FUTURE MANAGEMENT

2021 ◽  
pp. 142-147
Author(s):  
M. Yu. Zakharov
Keyword(s):  
Traditional Model ◽  
Life Changes ◽  
Ancient China ◽  
The Past ◽  
Cultural Foundations ◽  
Chinese Model ◽  
The Future ◽  
The Veil ◽  
Future Management

The article performs an analysis of the maxim of Ancient China, according to which further life, changes can be controlled if you first lift the veil of the past and present, look into the future and it is better to construct its desired image and move towards it. To this end, the author considers the traditional model of managing current changes and possible future, formed within the framework of the spiritual culture of China, which has found its modern embodiment in the technology of Chinese foresight. The paper determines the socio-cultural foundations of the model, the nature of prognostic knowledge, the features of its implementation in the form of effective inaction. The author pays special attention in the article to the understanding of the Chinese phenomenon of the future and its cosmological basis, the role of the “Supreme Ultimate” (Taiji) in the prognostic process, the latent side of the cognitive prognostic technology.

scholarly journals Origins of hydrocarbons in the Geneva Basin: insights from oil, gas and source rock organic geochemistry

2021 ◽  
Vol 114 (1) ◽  
Author(s):  
Damien Do Couto ◽  
Sylvain Garel ◽  
Andrea Moscariello ◽  
Samer Bou Daher ◽  
Ralf Littke ◽  
...  
Keyword(s):  
Organic Matter ◽  
Source Rock ◽  
Oil And Gas ◽  
Organic Geochemistry ◽  
Source Rocks ◽  
Type Ii ◽  
Dominant Type ◽  
Type Iii ◽  
North Alpine Foreland Basin ◽  
Migration Pathways

AbstractAn extensive subsurface investigation evaluating the geothermal energy resources and underground thermal energy storage potential is being carried out in the southwestern part of the Swiss Molasse Basin around the Geneva Canton. Among this process, the evaluation of the petroleum source-rock type and potential is an important step to understand the petroleum system responsible of some oil and gas shows at surface and subsurface. This study provides a first appraisal of the risk to encounter possible undesired occurrence of hydrocarbons in the subsurface of the Geneva Basin. Upon the numerous source-rocks mentioned in the petroleum systems of the North Alpine Foreland Basin, the marine Type II Toarcian shales (Lias) and the terrigenous Type III Carboniferous coals and shales have been sampled from wells and characterized with Rock–Eval pyrolysis and GC–MS analysis. The Toarcian shales (known as the Posidonia shales) are showing a dominant Type II organic matter composition with a Type III component in the Jura region and the south of the basin. Its thermal maturity (~ 0.7 VRr%) shows that this source-rock currently generates hydrocarbons at depth. The Carboniferous coals and shales show a dominant Type III organic matter with slight marine to lacustrine component, in the wet gas window below the Geneva Basin. Two bitumen samples retrieved at surface (Roulave stream) and in a shallow borehole (Satigny) are heavily biodegraded. Relative abundance of regular steranes of the Roulave bitumen indicates an origin from a marine Type II organic matter. The source of the Satigny bitumen is supposedly the same even though a deeper source-rock, such as the lacustrine Permian shales expelling oil in the Jura region, can’t be discarded. The oil-prone Toarcian shales in the oil window are the most likely source of this bitumen. A gas pocket encountered in the shallow well of Satigny (Geneva Canton), was investigated for molecular and stable isotopic gas composition. The analyses indicated that the gas is made of a mixture of microbial (very low δ13C1) and thermogenic gas. The isotopic composition of ethane and propane suggests a thermogenic origin from an overmature Type II source-rock (> 1.6 VRr%) or from a terrigenous Type III source at a maturity of ~ 1.2 VRr%. The Carboniferous seems to be the only source-rock satisfying these constraints at depth. The petroleum potential of the marine Toarcian shales below the Geneva Basin remains nevertheless limited given the limited thickness of the source-rock across the area and does not pose a high risk for geothermal exploration. A higher risk is assigned to Permian and Carboniferous source-rocks at depth where they reached gas window maturity and generated large amount of gas below sealing Triassic evaporites. The large amount of faults and fractures cross-cutting the entire stratigraphic succession in the basin certainly serve as preferential migration pathways for gas, explaining its presence in shallow stratigraphic levels such as at Satigny.

scholarly journals Motif dan Makna Berjilbab Mahasiswi Komunikasi Universitas Tadulako Palu

2020 ◽  
Vol 4 (1) ◽  
pp. 67-84
Author(s):  
Sitti Murni Kaddi ◽  
Enjang Muhaemin
Keyword(s):  
Muslim Women ◽  
Phenomenological Approach ◽  
Female Students ◽  
Communication Studies ◽  
Dress Code ◽  
The Past ◽  
Political Sciences ◽  
Depth Interview ◽  
The Future ◽  
The Veil

This research is motivated by the increasing use of the veil among female students. Although basically wearing the hijab is a dress code that is required by Islam for Muslim women, but it is proven that only some of them wear the hijab. This reality shows, besides the syar'i provisions that are obeyed, there seems to be something else that makes some Muslim women feel confident to wear the hijab. This research-based paper aims to find out the motives and meanings of wearing headscarves by the students of Communication Studies at the Faculty of Social and Political Sciences, Tadulako University, Palu. The study uses qualitative research methods, with in-depth interview techniques, and observation, with the aim of exploring the motives and veiled meanings of the female students. Research uses a phenomenological approach. The results of the study concluded two things. First, the motives of female students wearing headscarves are divided into two, namely the motives of the past and the motives of the future. Motives of the past are encouraged because of encouragement and advice from parents and family, as well as shar'i motifs based on obligations established by Islam. The future motives underlying the female students using veil are divided into the motive of wanting to avoid bad things, wanting to control their behavior, and wanting to be appreciated. Second, related to self-meaning, the students who wear the hijab interpret it as proof of love for God, and as a service to both parents. Penelitian ini dilatarbelakangi semakin meningkatnya penggunaan jilbab di kalangan mahasiswi. Kendati pada dasarnya menggunakan jilbab merupakan aturan berpakaian yang disyariatkan Islam bagi perempuan muslim, namun terbukti hanya sebagian yang menggunakan jilbab. Realitas ini menunjukkan, selain ketentuan syar’i yang ditaati, sepertinya ada hal lain yang membuat sebagian perempuan muslimah merasa yakin untuk menggunakan jilbab. Tulisan berbasis penelitian ini bertujuan untuk mengetahui motif dan makna pemakaian jilbab yang dilakukan para mahasiswi Ilmu Komunikasi FISIP Universitas Tadulako Palu. Penelitian menggunakan metode penelitian kualitatif, dengan teknik wawancara mendalam, dan observasi,  dengan tujuan menggali motif, dan makna berjilbab para mahasiswi. Penelitian menggunakan pendekatan fenomenologis. Hasil penelitian menyimpulkan dua hal. Pertama, motif mahasiswi memakai jilbab  terbagi menjadi dua, yaitu motif masa lalu dan motif masa depan. Motif masa lalu didorong karena dorongan dan nasehat dari orang tua dan keluarga, serta motif syar’i yang didasarkan pada kewajiban yang ditetapkan Islam. Adapun motif masa depan yang mendasari mahasiswi menggunakan jilbab terpilah pada motif ingin menghindari hal-hal buruk, ingin mengontrol tingkah laku, dan ingin dihargai. Kedua, berkaitan dengan makna diri,  para mahasiswi pemakai jilbab memaknainya sebagai bukti sayang kepada Allah, dan sebagai bakti kepada kedua orang tua.

scholarly journals Source rock geochemistry of shale samples from Ege-1 and Ege-2 wells, Niger Delta, Nigeria

2020 ◽  
Author(s):  
S. L. Fadiya ◽  
S. A. Adekola ◽  
B. M. Oyebamiji ◽  
O. T. Akinsanpe
Keyword(s):  
Source Rock ◽  
Niger Delta ◽  
Source Rocks ◽  
Organic Carbon Content ◽  
Hydrocarbon Generation ◽  
Type Ii ◽  
Early Maturity ◽  
Type Iii ◽  
Niger Delta Basin ◽  
Rock Eval

AbstractSelected shale samples within the middle Miocene Agbada Formation of Ege-1 and Ege-2 wells, Niger Delta Basin, Nigeria, were evaluated using total organic carbon content (TOC) and Rock–Eval pyrolysis examination with the aim of determining their hydrocarbon potential. The results obtained reveal TOC values varying from 1.64 to 2.77 wt% with an average value of 2.29 wt% for Ege-1 well, while Ege-2 well TOC values ranged from 1.27 to 3.28 wt% (average of 2.27 wt%) values which both fall above the minimum threshold (0.5%) for hydrocarbon generation potential in the Niger Delta. Rock–Eval pyrolysis data revealed that the shale source rock samples from Ege-1 well are characterized by Type II–Type III kerogens which are thermally mature to generate oil or gas/oil. The Ege-2 well pyrolysis result showed that some of the ditch cutting samples are comprised of Type II (oil prone) and Type III (gas-prone kerogen) which are thermally immature to marginal maturity (Tmax 346–439 °C). This study concludes that the shale intercalations between reservoir sands of the Agbada Formation are good source rocks in early maturity and also must have contributed to the vast petroleum reserve in the Niger Delta Basin because of the subsidence of the basin.

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