Tight sandstones

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Tight sandstones

Postoleh Aveliansyah » Rab Mei 09, 2012 3:34 pm

Di suatu formasi yang terkubur cukup dalam (10.000-an feet), ditemukan 3 interval batupasir, yaitu batupasir A (10.000 feet), B (10.200 feet), dan C. (10.400 feet).
Batupasir A dan C adalah reservoir yang bagus, dengan hasil test yang cukup memuaskan. Akan tetapi batupasir B yang berada ditengah-tengah malah tight dan no hidrocarbon flow.

Kira-kira apa yang menyebabkan hal tersebut terjadi ya?
Terimakasih sebelumnya

salam
yang sedang belajar geologi
Aveliansyah
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Re: Tight sandstones

Postoleh Iqbal Fardiansyah » Rab Mei 09, 2012 4:56 pm

Dear brur avel,

kl blh tau jenis sandnya apa ya brur? kl menurutku jika kita mendapat sand tight diantara reservoir sand dalam interval 200 feet :

1. bisa most likely factor diagenetic sangat mempengaruhi terutama percentage mineral2 penyusun sand tersebut, dimana adanya mineral2 resistan (ex :quartz group)maupun mineral yg tidak resistan dan gampang terubah(ex : plagioclase group,autogenic mineral).kandungan mineral lempung yang tinggipun mengakibatkan sand tight,hal ini sebelum terjadi diagensis pun bisa terjadi apabila overburden pressure tinggi yang membuat volume pori dan pore throat semakin mengecil akibat pseudo clay/matrix.

2. bisa saja ketiga sand tersebut memiliki character yang sama, tetapi pada saat sebelum diagenesis terjadi sand A dan C di migrasi oleh hydrocarbon sehingga menyelamatkan porosity kedua sand tersebut dan menghambat terjadinya diagenetic. sedangkn sand B tetap mengalami diagenesis shingga kemungkinan besar tight.


sedikit berbagi,tolong dikoreksi ya brur kl salah

salam

ogepz
Iqbal Fardiansyah
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Bergabung: Sen Apr 23, 2012 4:03 pm

Re: Tight sandstones

Postoleh dek_hari » Sen Okt 15, 2012 8:17 pm

ini kok gak ada kelanjutannya ya kak?
ada hipotesis lainkah?
kalo menurut sayamasih terlalu luas untuk menarik suatu deduksi dari situ, karena belum gamblang data-datanya
dek_hari
 
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Bergabung: Sen Okt 15, 2012 8:06 pm

Re: Tight sandstones

Postoleh Madara » Jum Okt 19, 2012 12:58 pm

Mas Aveliansyah,

Reservoir itu bisa flow atau tidak basicnya karena dua hal yaitu memang reservoir propertiesnya jelek atau karena karena ada yang menyebabkan tidak flow. jika masalahnya tight sandstone berati reservoir itu punya low porosity (<10%) dan low permeability (<0.1mD)seharusnya disiasati dengan fracturing atau acidicing, gangguannya lain karena tidak flow juga karena akibat formation damage, penggunaan mudweight yang terlalu tinggi, akibabtnya invasi akan sangat dalam maka lebih baik menggunakan underbalance dan bisa jadi mungkin salah tembak saat first test perforation.,
untuk mengetahui detailnya bisa digunakan analisa petrofasies, bisa jadi tidak flow karena memang propertiesnya jelek atau ada yang lain..

salam
Madara
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Bergabung: Rab Jun 27, 2012 12:38 pm

Re: Tight sandstones

Postoleh Darmawan Eko » Kam Agt 13, 2015 11:42 am

Vel,

Setuju dengan Iqbal, glauconite nya melimpah kah?
Kadang glauconite yang diendapkan di shallow marine menyebabkan batupasir menjadi tight sand karena mengalami sementasi yang kuat, seperti tabel di bawah (lupa sumbernya)

Gambar

Tapi case nya avel posisi batupasir cukup dalam, bisa jadi dipengaruhi overburden juga dimana tekanan dan temperatur mempengaruhi perbedaan perubahan kimiawi dari masing-masing lapisan batupasir, namun yang pasti komposisi mineral silika yang dominan sebagai penyusun batuan klastik dan juga proses sedimentasi lah yang menentukan hasil akhir produk batuan klastik.

salam
DEH
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