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Sequence Stratigraphy of the Jurassi...

Haas, Lucas James.

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Sequence Stratigraphy of the Jurassic - Miocene sections, Offshore Morondava Basin, Western Madagascar.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Sequence Stratigraphy of the Jurassic - Miocene sections, Offshore Morondava Basin, Western Madagascar./
Author:	Haas, Lucas James.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	216 p.
Notes:	Source: Masters Abstracts International, Volume: 81-02.
Contained By:	Masters Abstracts International81-02.
Subject:	Geology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13807956
ISBN:	9781085592826

Sequence Stratigraphy of the Jurassic - Miocene sections, Offshore Morondava Basin, Western Madagascar.
Haas, Lucas James.

Sequence Stratigraphy of the Jurassic - Miocene sections, Offshore Morondava Basin, Western Madagascar. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 216 p.

Source: Masters Abstracts International, Volume: 81-02.

Thesis (M.S.)--University of Colorado at Boulder, 2019.

This item must not be sold to any third party vendors.

Located on the western coast of Madagascar, the offshore Morondava Basin is a frontier hydrocarbon exploration area. Onshore exploration activity has made several finds, including gas and heavy oil discoveries, but ceased in 1992; no offshore wells have been drilled since 1985. The Upper Cretaceous - Miocene sections were interpreted using a 3,200 km2 time-migrated 3-D seismic data set, in addition to well data from shallow updip wells. A sequence stratigraphic framework is presented, in addition to the trapping potential of Oligocene-Miocene turbidite deposits. Four second-order Upper Jurassic - Miocene megasequences were defined. Each megasequence is composed of multiple third-order sequences. Megasequences vary in structure, time-thickness, depositional environment, seismic facies, and areal distribution. Megasequence 1 (MS 1, Upper Jurassic - Maastrichtian) consists of deepwater shales. Megasequence 2 (MS 2, Paleocene - Oligocene) is an aggradational carbonate deposit with thinner shales deposited in the southern portion of the study area. MS 2 is interpreted to have been deposited in shallower water depths and did not extend as far into the basin as MS 1. A major erosional event removes a significant (up to 1.2 seconds, twt) amount of MS 1 and MS 2 sediment, this event is represented by a regional erosive marker (Oligocene sequence boundary). Megasequence 3 (MS 3, Oligocene - Miocene) comprises seven sequences deposited in a base-of-slope setting. These seven sequences, which consist of channel and levee-overbank deposits, onlap the Oligocene sequence boundary. MS 3 sequences backstep up the Oligocene sequence boundary, with each sequence deposited successively further upslope. These seven sequences migrate northward in a laterally offset stacking pattern. Megasequence 4 (MS 4, Miocene) represents a reversion to a progradational margin, and comprises sets of prograding clinoforms updip, and downlapping reflections basinward. No wells have been drilled in the deepwater portion of the basin. As a result, reservoir and seal lithologies cannot be directly analyzed. However, seismic data suggests that stratigraphic traps, and structural traps above igneous intrusions, are present. Seafloor sediment cores suggest there are generating source rocks in the area. Updip (onshore) wells show average TOC values of 2.5% in the proposed Cretaceous marine shale source rock interval.

ISBN: 9781085592826Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Deepwater

Sequence Stratigraphy of the Jurassic - Miocene sections, Offshore Morondava Basin, Western Madagascar.
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245 1 0 $a Sequence Stratigraphy of the Jurassic - Miocene sections, Offshore Morondava Basin, Western Madagascar.
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500 $a Source: Masters Abstracts International, Volume: 81-02.
500 $a Advisor: Weimer, Paul.
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506 $a This item must not be sold to any third party vendors.
520 $a Located on the western coast of Madagascar, the offshore Morondava Basin is a frontier hydrocarbon exploration area. Onshore exploration activity has made several finds, including gas and heavy oil discoveries, but ceased in 1992; no offshore wells have been drilled since 1985. The Upper Cretaceous - Miocene sections were interpreted using a 3,200 km2 time-migrated 3-D seismic data set, in addition to well data from shallow updip wells. A sequence stratigraphic framework is presented, in addition to the trapping potential of Oligocene-Miocene turbidite deposits. Four second-order Upper Jurassic - Miocene megasequences were defined. Each megasequence is composed of multiple third-order sequences. Megasequences vary in structure, time-thickness, depositional environment, seismic facies, and areal distribution. Megasequence 1 (MS 1, Upper Jurassic - Maastrichtian) consists of deepwater shales. Megasequence 2 (MS 2, Paleocene - Oligocene) is an aggradational carbonate deposit with thinner shales deposited in the southern portion of the study area. MS 2 is interpreted to have been deposited in shallower water depths and did not extend as far into the basin as MS 1. A major erosional event removes a significant (up to 1.2 seconds, twt) amount of MS 1 and MS 2 sediment, this event is represented by a regional erosive marker (Oligocene sequence boundary). Megasequence 3 (MS 3, Oligocene - Miocene) comprises seven sequences deposited in a base-of-slope setting. These seven sequences, which consist of channel and levee-overbank deposits, onlap the Oligocene sequence boundary. MS 3 sequences backstep up the Oligocene sequence boundary, with each sequence deposited successively further upslope. These seven sequences migrate northward in a laterally offset stacking pattern. Megasequence 4 (MS 4, Miocene) represents a reversion to a progradational margin, and comprises sets of prograding clinoforms updip, and downlapping reflections basinward. No wells have been drilled in the deepwater portion of the basin. As a result, reservoir and seal lithologies cannot be directly analyzed. However, seismic data suggests that stratigraphic traps, and structural traps above igneous intrusions, are present. Seafloor sediment cores suggest there are generating source rocks in the area. Updip (onshore) wells show average TOC values of 2.5% in the proposed Cretaceous marine shale source rock interval.
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653 $a Offshore exploration
653 $a Sequence stratigraphy
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